{"id":4336,"date":"2023-07-21T13:52:08","date_gmt":"2023-07-21T05:52:08","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=4336"},"modified":"2023-07-21T13:52:08","modified_gmt":"2023-07-21T05:52:08","slug":"21%e4%b8%aamysql%e8%a1%a8%e8%ae%be%e8%ae%a1%e7%9a%84%e7%bb%8f%e9%aa%8c%e5%87%86%e5%88%99","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=4336","title":{"rendered":"21\u4e2aMySQL\u8868\u8bbe\u8ba1\u7684\u7ecf\u9a8c\u51c6\u5219"},"content":{"rendered":"\n

\u539f\u6587\uff1a21\u4e2aMySQL\u8868\u8bbe\u8ba1\u7684\u7ecf\u9a8c\u51c6\u5219 – \u77e5\u4e4e (zhihu.com)<\/a><\/p>\n\n\n\n

1.\u547d\u540d\u89c4\u8303<\/h2>\n\n\n\n

\u6570\u636e\u5e93\u8868\u540d\u3001\u5b57\u6bb5\u540d\u3001\u7d22\u5f15\u540d\u7b49\u90fd\u9700\u8981\u547d\u540d\u89c4\u8303\uff0c\u53ef\u8bfb\u6027\u9ad8(\u4e00\u822c\u8981\u6c42\u7528\u82f1\u6587)\uff0c\u8ba9\u522b\u4eba\u4e00\u770b\u547d\u540d\uff0c\u5c31\u77e5\u9053\u8fd9\u4e2a\u5b57\u6bb5\u8868\u793a\u4ec0\u4e48\u610f\u601d\u3002<\/p>\n\n\n\n

\u6bd4\u5982\u4e00\u4e2a\u8868\u7684\u8d26\u53f7\u5b57\u6bb5\uff0c\u53cd\u4f8b\u5982\u4e0b<\/strong>\uff1a<\/p>\n\n\n\n

acc_no,1_acc_no,zhanghao<\/code><\/pre>\n\n\n\n
\u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
account_no,account_number<\/code><\/pre>\n\n\n\n
    \n
  • \u8868\u540d\u3001\u5b57\u6bb5\u540d\u5fc5\u987b\u4f7f\u7528\u5c0f\u5199\u5b57\u6bcd\u6216\u8005\u6570\u5b57\uff0c\u7981\u6b62\u4f7f\u7528\u6570\u5b57\u5f00\u5934\uff0c\u7981\u6b62\u4f7f\u7528\u62fc\u97f3\uff0c\u5e76\u4e14\u4e00\u822c\u4e0d\u4f7f\u7528\u82f1\u6587\u7f29\u5199\u3002<\/li>\n\n\n\n
  • \u4e3b\u952e\u7d22\u5f15\u540d\u4e3apk_\u5b57\u6bb5\u540d<\/code>\uff1b\u552f\u4e00\u7d22\u5f15\u540d\u4e3auk_\u5b57\u6bb5\u540d<\/code>\uff1b\u666e\u901a\u7d22\u5f15\u540d\u5219\u4e3aidx_\u5b57\u6bb5\u540d<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n
    2.\u9009\u62e9\u5408\u9002\u7684\u5b57\u6bb5\u7c7b\u578b<\/h2>\n\n\n\n
    \u8bbe\u8ba1\u8868\u65f6\uff0c\u6211\u4eec\u9700\u8981\u9009\u62e9\u5408\u9002\u7684\u5b57\u6bb5\u7c7b\u578b\uff0c\u6bd4\u5982\uff1a<\/p>\n\n\n\n
      \n
    • \u5c3d\u53ef\u80fd\u9009\u62e9\u5b58\u50a8\u7a7a\u95f4\u5c0f\u7684\u5b57\u6bb5\u7c7b\u578b\uff0c\u5c31\u597d\u50cf\u6570\u5b57\u7c7b\u578b\u7684\uff0c\u4ecetinyint\u3001smallint\u3001int\u3001bigint<\/code>\u4ece\u5de6\u5f80\u53f3\u5f00\u59cb\u9009\u62e9<\/li>\n\n\n\n
    • \u5c0f\u6570\u7c7b\u578b\u5982\u91d1\u989d\uff0c\u5219\u9009\u62e9 decimal<\/code>\uff0c\u7981\u6b62\u4f7f\u7528 float<\/code> \u548c double<\/code>\u3002<\/li>\n\n\n\n
    • \u5982\u679c\u5b58\u50a8\u7684\u5b57\u7b26\u4e32\u957f\u5ea6\u51e0\u4e4e\u76f8\u7b49\uff0c\u4f7f\u7528 char<\/code> \u5b9a\u957f\u5b57\u7b26\u4e32\u7c7b\u578b\u3002<\/li>\n\n\n\n
    • varchar<\/code>\u662f\u53ef\u53d8\u957f\u5b57\u7b26\u4e32\uff0c\u4e0d\u9884\u5148\u5206\u914d\u5b58\u50a8\u7a7a\u95f4\uff0c\u957f\u5ea6\u4e0d\u8981\u8d85\u8fc75000<\/code>\u3002<\/li>\n\n\n\n
    • \u5982\u679c\u5b58\u50a8\u7684\u503c\u592a\u5927\uff0c\u5efa\u8bae\u5b57\u6bb5\u7c7b\u578b\u4fee\u6539\u4e3atext<\/code>\uff0c\u540c\u65f6\u62bd\u51fa\u5355\u72ec\u4e00\u5f20\u8868\uff0c\u7528\u4e3b\u952e\u4e0e\u4e4b\u5bf9\u5e94\u3002<\/li>\n\n\n\n
    • \u540c\u4e00\u8868\u4e2d\uff0c\u6240\u6709varchar<\/code>\u5b57\u6bb5\u7684\u957f\u5ea6\u52a0\u8d77\u6765\uff0c\u4e0d\u80fd\u5927\u4e8e65535<\/code>. \u5982\u679c\u6709\u8fd9\u6837\u7684\u9700\u6c42\uff0c\u8bf7\u4f7f\u7528TEXT\/LONGTEXT<\/code> \u7c7b\u578b\u3002<\/li>\n<\/ul>\n\n\n\n
      3. \u4e3b\u952e\u8bbe\u8ba1\u8981\u5408\u7406<\/h2>\n\n\n\n
      \u4e3b\u952e\u8bbe\u8ba1\u7684\u8bdd\uff0c\u6700\u597d\u4e0d\u8981\u4e0e\u4e1a\u52a1\u903b\u8f91\u6709\u6240\u5173\u8054\u3002\u6709\u4e9b\u4e1a\u52a1\u4e0a\u7684\u5b57\u6bb5\uff0c\u6bd4\u5982\u8eab\u4efd\u8bc1\uff0c\u867d\u7136\u662f\u552f\u4e00\u7684\uff0c\u4e00\u4e9b\u5f00\u53d1\u8005\u559c\u6b22\u7528\u5b83\u6765\u505a\u4e3b\u952e\uff0c\u4f46\u662f\u4e0d\u662f\u5f88\u5efa\u8bae\u54c8\u3002\u4e3b\u952e\u6700\u597d\u662f\u6beb\u65e0\u610f\u4e49\u7684\u4e00\u4e32\u72ec\u7acb\u4e0d\u91cd\u590d\u7684\u6570\u5b57\uff0c\u6bd4\u5982UUID<\/code>\uff0c\u53c8\u6216\u8005Auto_increment<\/code>\u81ea\u589e\u7684\u4e3b\u952e\uff0c\u6216\u8005\u662f\u96ea\u82b1\u7b97\u6cd5\u751f\u6210\u7684\u4e3b\u952e\u7b49\u7b49;<\/p>\n\n\n\n
      4. \u9009\u62e9\u5408\u9002\u7684\u5b57\u6bb5\u957f\u5ea6<\/h2>\n\n\n\n
      \u5148\u95ee\u5927\u5bb6\u4e00\u4e2a\u95ee\u9898\uff0c\u5927\u5bb6\u77e5\u9053\u6570\u636e\u5e93\u5b57\u6bb5\u957f\u5ea6\u8868\u793a\u5b57\u7b26\u957f\u5ea6<\/strong>\u8fd8\u662f\u5b57\u8282\u957f\u5ea6<\/strong>\u561b\uff1f<\/p>\n\n\n\n
      \n
      \u5176\u5b9e\u5728mysql\u4e2d\uff0cvarchar<\/code>\u548cchar<\/code>\u7c7b\u578b\u8868\u793a\u5b57\u7b26\u957f\u5ea6\uff0c\u800c\u5176\u4ed6\u7c7b\u578b\u8868\u793a\u7684\u957f\u5ea6\u90fd\u8868\u793a\u5b57\u8282\u957f\u5ea6\u3002\u6bd4\u5982char(10)<\/code>\u8868\u793a\u5b57\u7b26\u957f\u5ea6\u662f10\uff0c\u800cbigint\uff084\uff09<\/code>\u8868\u793a\u663e\u793a\u957f\u5ea6\u662f4<\/code>\u4e2a\u5b57\u8282\uff0c\u4f46\u662f\u56e0\u4e3abigint\u5b9e\u9645\u957f\u5ea6\u662f8<\/code>\u4e2a\u5b57\u8282\uff0c\u6240\u4ee5bigint\uff084\uff09\u7684\u5b9e\u9645\u957f\u5ea6\u5c31\u662f8\u4e2a\u5b57\u8282\u3002<\/p>\n<\/blockquote>\n\n\n\n
      \u6211\u4eec\u5728\u8bbe\u8ba1\u8868\u7684\u65f6\u5019\uff0c\u9700\u8981\u5145\u5206\u8003\u8651\u4e00\u4e2a\u5b57\u6bb5\u7684\u957f\u5ea6\uff0c\u6bd4\u5982\u4e00\u4e2a\u7528\u6237\u540d\u5b57\u6bb5\uff08\u5b83\u7684\u957f\u5ea65~20\u4e2a\u5b57\u7b26\uff09\uff0c\u4f60\u89c9\u5f97\u5e94\u8be5\u8bbe\u7f6e\u591a\u957f\u5462\uff1f\u53ef\u4ee5\u8003\u8651\u8bbe\u7f6e\u4e3a username varchar\uff0832\uff09<\/code>\u3002\u5b57\u6bb5\u957f\u5ea6\u4e00\u822c\u8bbe\u7f6e\u4e3a2\u7684\u5e42\u54c8\uff08\u4e5f\u5c31\u662f2\u7684n<\/code>\u6b21\u65b9\uff09\u3002\u2019;<\/p>\n\n\n\n
      5\uff0c\u4f18\u5148\u8003\u8651\u903b\u8f91\u5220\u9664\uff0c\u800c\u4e0d\u662f\u7269\u7406\u5220\u9664<\/h2>\n\n\n\n
      \u4ec0\u4e48\u662f\u7269\u7406\u5220\u9664\uff1f\u4ec0\u4e48\u662f\u903b\u8f91\u5220\u9664\uff1f<\/p>\n\n\n\n
        \n
      • \u7269\u7406\u5220\u9664\uff1a\u628a\u6570\u636e\u4ece\u786c\u76d8\u4e2d\u5220\u9664\uff0c\u53ef\u91ca\u653e\u5b58\u50a8\u7a7a\u95f4<\/li>\n\n\n\n
      • \u903b\u8f91\u5220\u9664\uff1a\u7ed9\u6570\u636e\u6dfb\u52a0\u4e00\u4e2a\u5b57\u6bb5\uff0c\u6bd4\u5982is_deleted<\/code>\uff0c\u4ee5\u6807\u8bb0\u8be5\u6570\u636e\u5df2\u7ecf\u903b\u8f91\u5220\u9664\u3002<\/li>\n<\/ul>\n\n\n\n
        \u7269\u7406\u5220\u9664\u5c31\u662f\u6267\u884cdelete<\/code>\u8bed\u53e5\uff0c\u5982\u5220\u9664account_no =\u2018666\u2019<\/code>\u7684\u8d26\u6237\u4fe1\u606fSQL\u5982\u4e0b\uff1a<\/p>\n\n\n\n
        delete from account_info_tab whereaccount_no ='666';<\/code><\/pre>\n\n\n\n
        \u903b\u8f91\u5220\u9664\u5462\uff0c\u5c31\u662f\u8fd9\u6837\uff1a<\/p>\n\n\n\n
        update account_info_tab set is_deleted = 1 where account_no ='666';<\/code><\/pre>\n\n\n\n
        \u4e3a\u4ec0\u4e48\u63a8\u8350\u7528\u903b\u8f91\u5220\u9664\uff0c\u4e0d\u63a8\u8350\u7269\u7406\u5220\u9664\u5462\uff1f<\/strong><\/p>\n\n\n\n
          \n
        • \u4e3a\u4ec0\u4e48\u4e0d\u63a8\u8350\u4f7f\u7528\u7269\u7406\u5220\u9664\uff0c\u56e0\u4e3a\u6062\u590d\u6570\u636e\u5f88\u56f0\u96be<\/li>\n\n\n\n
        • \u7269\u7406\u5220\u9664\u4f1a\u4f7f\u81ea\u589e\u4e3b\u952e\u4e0d\u518d\u8fde\u7eed<\/li>\n\n\n\n
        • \u6838\u5fc3\u4e1a\u52a1\u8868 \u7684\u6570\u636e\u4e0d\u5efa\u8bae\u505a\u7269\u7406\u5220\u9664\uff0c\u53ea\u9002\u5408\u505a\u72b6\u6001\u53d8\u66f4\u3002<\/li>\n<\/ul>\n\n\n\n
          6. \u6bcf\u4e2a\u8868\u90fd\u9700\u8981\u6dfb\u52a0\u8fd9\u51e0\u4e2a\u901a\u7528\u5b57\u6bb5\u5982\u4e3b\u952e\u3001create_time\u3001modifed_time\u7b49<\/h2>\n\n\n\n
          \u8868\u5fc5\u5907\u4e00\u822c\u6765\u8bf4\uff0c\u6216\u5177\u5907\u8fd9\u51e0\u4e2a\u5b57\u6bb5\uff1a<\/p>\n\n\n\n
            \n
          • id\uff1a\u4e3b\u952e\uff0c\u4e00\u4e2a\u8868\u5fc5\u987b\u5f97\u6709\u4e3b\u952e\uff0c\u5fc5\u987b<\/li>\n\n\n\n
          • create_time\uff1a\u521b\u5efa\u65f6\u95f4\uff0c\u5fc5\u987b<\/li>\n\n\n\n
          • modifed_time\/update_time: \u4fee\u6539\u65f6\u95f4\uff0c\u5fc5\u987b\uff0c\u66f4\u65b0\u8bb0\u5f55\u65f6\uff0c\u9700\u8981\u66f4\u65b0\u5b83<\/li>\n\n\n\n
          • version : \u6570\u636e\u8bb0\u5f55\u7684\u7248\u672c\u53f7\uff0c\u7528\u4e8e\u4e50\u89c2\u9501\uff0c\u975e\u5fc5\u987b<\/li>\n\n\n\n
          • remark \uff1a\u6570\u636e\u8bb0\u5f55\u5907\u6ce8\uff0c\u975e\u5fc5\u987b<\/li>\n\n\n\n
          • modified_by :\u4fee\u6539\u4eba\uff0c\u975e\u5fc5\u987b<\/li>\n\n\n\n
          • creator \uff1a\u521b\u5efa\u4eba\uff0c\u975e\u5fc5\u987b<\/li>\n<\/ul>\n\n\n\n
            7. \u4e00\u5f20\u8868\u7684\u5b57\u6bb5\u4e0d\u5b9c\u8fc7\u591a<\/h2>\n\n\n\n
            \u6211\u4eec\u5efa\u8868\u7684\u65f6\u5019\uff0c\u8981\u7262\u8bb0\uff0c\u4e00\u5f20\u8868\u7684\u5b57\u6bb5\u4e0d\u5b9c\u8fc7\u591a\u54c8\uff0c\u4e00\u822c\u5c3d\u91cf\u4e0d\u8981\u8d85\u8fc720\u4e2a\u5b57\u6bb5\u54c8\u3002\u7b14\u8005\u8bb0\u5f97\u4e0a\u4e2a\u516c\u53f8\uff0c\u6709\u4f19\u4f34\u8bbe\u8ba1\u5f00\u6237\u8868\uff0c\u52a0\u4e86\u4e94\u5341\u591a\u4e2a\u5b57\u6bb5\u3002\u3002\u3002<\/p>\n\n\n\n
            \u5982\u679c\u4e00\u5f20\u8868\u7684\u5b57\u6bb5\u8fc7\u591a\uff0c\u8868\u4e2d\u4fdd\u5b58\u7684\u6570\u636e\u53ef\u80fd\u5c31\u4f1a\u5f88\u5927\uff0c\u67e5\u8be2\u6548\u7387\u5c31\u4f1a\u5f88\u4f4e\u3002\u56e0\u6b64\uff0c\u4e00\u5f20\u8868\u4e0d\u8981\u8bbe\u8ba1\u592a\u591a\u5b57\u6bb5\u54c8\uff0c\u5982\u679c\u4e1a\u52a1\u9700\u6c42\uff0c\u5b9e\u5728\u9700\u8981\u5f88\u591a\u5b57\u6bb5\uff0c\u53ef\u4ee5\u628a\u4e00\u5f20\u5927\u7684\u8868\uff0c\u62c6\u6210\u591a\u5f20\u5c0f\u7684\u8868\uff0c\u5b83\u4eec\u7684\u4e3b\u952e\u76f8\u540c\u5373\u53ef\u3002<\/p>\n\n\n\n
            \u5f53\u8868\u7684\u5b57\u6bb5\u6570\u975e\u5e38\u591a\u65f6\uff0c\u53ef\u4ee5\u5c06\u8868\u5206\u6210\u4e24\u5f20\u8868\uff0c\u4e00\u5f20\u4f5c\u4e3a\u6761\u4ef6\u67e5\u8be2\u8868\uff0c\u4e00\u5f20\u4f5c\u4e3a\u8be6\u7ec6\u5185\u5bb9\u8868 (\u4e3b\u8981\u662f\u4e3a\u4e86\u6027\u80fd\u8003\u8651)\u3002<\/p>\n\n\n\n
            8. \u5c3d\u53ef\u80fd\u4f7f\u7528not null\u5b9a\u4e49\u5b57\u6bb5<\/h2>\n\n\n\n
            \u5982\u679c\u6ca1\u6709\u7279\u6b8a\u7684\u7406\u7531\uff0c \u4e00\u822c\u90fd\u5efa\u8bae\u5c06\u5b57\u6bb5\u5b9a\u4e49\u4e3a NOT NULL<\/code> \u3002<\/p>\n\n\n\n
            \u4e3a\u4ec0\u4e48\u5462\uff1f<\/strong><\/p>\n\n\n\n
              \n
            • \u9996\u5148\uff0c NOT NULL<\/code> \u53ef\u4ee5\u9632\u6b62\u51fa\u73b0\u7a7a\u6307\u9488\u95ee\u9898\u3002<\/li>\n\n\n\n
            • \u5176\u6b21\uff0cNULL<\/code>\u503c\u5b58\u50a8\u4e5f\u9700\u8981\u989d\u5916\u7684\u7a7a\u95f4\u7684\uff0c\u5b83\u4e5f\u4f1a\u5bfc\u81f4\u6bd4\u8f83\u8fd0\u7b97\u66f4\u4e3a\u590d\u6742\uff0c\u4f7f\u4f18\u5316\u5668\u96be\u4ee5\u4f18\u5316SQL\u3002<\/li>\n\n\n\n
            • NULL<\/code>\u503c\u6709\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548<\/li>\n\n\n\n
            • \u5982\u679c\u5c06\u5b57\u6bb5\u9ed8\u8ba4\u8bbe\u7f6e\u6210\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e32\u6216\u5e38\u91cf\u503c\u5e76\u6ca1\u6709\u4ec0\u4e48\u4e0d\u540c\uff0c\u4e14\u90fd\u4e0d\u4f1a\u5f71\u54cd\u5230\u5e94\u7528\u903b\u8f91\uff0c \u90a3\u5c31\u53ef\u4ee5\u5c06\u8fd9\u4e2a\u5b57\u6bb5\u8bbe\u7f6e\u4e3aNOT NULL<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n
              9. \u8bbe\u8ba1\u8868\u65f6\uff0c\u8bc4\u4f30\u54ea\u4e9b\u5b57\u6bb5\u9700\u8981\u52a0\u7d22\u5f15<\/h2>\n\n\n\n
              \u9996\u5148\uff0c\u8bc4\u4f30\u4f60\u7684\u8868\u6570\u636e\u91cf\u3002\u5982\u679c\u4f60\u7684\u8868\u6570\u636e\u91cf\u53ea\u6709\u4e00\u767e\u51e0\u5341\u884c\uff0c\u5c31\u6ca1\u6709\u5fc5\u8981\u52a0\u7d22\u5f15\u3002\u5426\u5219\u8bbe\u8ba1\u8868\u7684\u65f6\u5019\uff0c\u5982\u679c\u6709\u67e5\u8be2\u6761\u4ef6\u7684\u5b57\u6bb5\uff0c\u4e00\u822c\u5c31\u9700\u8981\u5efa\u7acb\u7d22\u5f15\u3002\u4f46\u662f\u7d22\u5f15\u4e5f\u4e0d\u80fd\u6ee5\u7528\uff1a<\/p>\n\n\n\n
                \n
              • \u7d22\u5f15\u4e5f\u4e0d\u8981\u5efa\u5f97\u592a\u591a\uff0c\u4e00\u822c\u5355\u8868\u7d22\u5f15\u4e2a\u6570\u4e0d\u8981\u8d85\u8fc75<\/code>\u4e2a\u3002\u56e0\u4e3a\u521b\u5efa\u8fc7\u591a\u7684\u7d22\u5f15\uff0c\u4f1a\u964d\u4f4e\u5199\u5f97\u901f\u5ea6\u3002<\/li>\n\n\n\n
              • \u533a\u5206\u5ea6\u4e0d\u9ad8\u7684\u5b57\u6bb5\uff0c\u4e0d\u80fd\u52a0\u7d22\u5f15\uff0c\u5982\u6027\u522b\u7b49<\/li>\n\n\n\n
              • \u7d22\u5f15\u521b\u5efa\u5b8c\u540e\uff0c\u8fd8\u662f\u8981\u6ce8\u610f\u907f\u514d\u7d22\u5f15\u5931\u6548\u7684\u60c5\u51b5\uff0c\u5982\u4f7f\u7528mysql\u7684\u5185\u7f6e\u51fd\u6570\uff0c\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u7684<\/li>\n\n\n\n
              • \u7d22\u5f15\u8fc7\u591a\u7684\u8bdd\uff0c\u53ef\u4ee5\u901a\u8fc7\u8054\u5408\u7d22\u5f15\u7684\u8bdd\u65b9\u5f0f\u6765\u4f18\u5316\u3002\u7136\u540e\u7684\u8bdd\uff0c\u7d22\u5f15\u8fd8\u6709\u4e00\u4e9b\u89c4\u5219\uff0c\u5982\u8986\u76d6\u7d22\u5f15\uff0c\u6700\u5de6\u5339\u914d\u539f\u5219\u7b49\u7b49\u3002\u3002<\/li>\n<\/ul>\n\n\n\n
                \u5047\u8bbe\u4f60\u65b0\u5efa\u4e00\u5f20\u7528\u6237\u8868\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
                CREATE TABLE user_info_tab (\n  `id` int(11) NOT NULL AUTO_INCREMENT,\n  `user_id` int(11) NOT NULL,\n  `age` int(11) DEFAULT NULL,\n  `name` varchar(255) NOT NULL,\n  `create_time` datetime NOT NULL,\n  `modifed_time` datetime NOT NULL,\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;<\/code><\/pre>\n\n\n\n
                \u5bf9\u4e8e\u8fd9\u5f20\u8868\uff0c\u5f88\u53ef\u80fd\u4f1a\u6709\u6839\u636euser_id<\/code>\u6216\u8005name<\/code>\u67e5\u8be2\u7528\u6237\u4fe1\u606f\uff0c\u5e76\u4e14\uff0cuser_id<\/code>\u662f\u552f\u4e00\u7684\u3002\u56e0\u6b64\uff0c\u4f60\u662f\u53ef\u4ee5\u7ed9user_id<\/code>\u52a0\u4e0a\u552f\u4e00\u7d22\u5f15\uff0cname<\/code>\u52a0\u4e0a\u666e\u901a\u7d22\u5f15\u3002<\/p>\n\n\n\n
                CREATE TABLE user_info_tab (\n  `id` int(11) NOT NULL AUTO_INCREMENT,\n  `user_id` int(11) NOT NULL,\n  `age` int(11) DEFAULT NULL,\n  `name` varchar(255) NOT NULL,\n  `create_time` datetime NOT NULL,\n  `modifed_time` datetime NOT NULL,\n  PRIMARY KEY (`id`),\n  KEY `idx_name` (`name`) USING BTREE,\n  UNIQUE KEY un_user_id (user_id)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;<\/code><\/pre>\n\n\n\n
                10. \u4e0d\u9700\u8981\u4e25\u683c\u9075\u5b88 3NF\uff0c\u901a\u8fc7\u4e1a\u52a1\u5b57\u6bb5\u5197\u4f59\u6765\u51cf\u5c11\u8868\u5173\u8054<\/h2>\n\n\n\n
                \u4ec0\u4e48\u662f\u6570\u636e\u5e93\u4e09\u8303\u5f0f\uff083NF<\/code>\uff09\uff0c\u5927\u5bb6\u662f\u5426\u8fd8\u6709\u5370\u8c61\u5417\uff1f<\/p>\n\n\n\n
                  \n
                • \u7b2c\u4e00\u8303\u5f0f\uff1a\u5bf9\u5c5e\u6027\u7684\u539f\u5b50\u6027\uff0c\u8981\u6c42\u5c5e\u6027\u5177\u6709\u539f\u5b50\u6027\uff0c\u4e0d\u53ef\u518d\u5206\u89e3\uff1b<\/li>\n\n\n\n
                • \u7b2c\u4e8c\u8303\u5f0f\uff1a\u5bf9\u8bb0\u5f55\u7684\u552f\u4e00\u6027\uff0c\u8981\u6c42\u8bb0\u5f55\u6709\u552f\u4e00\u6807\u8bc6\uff0c\u5373\u5b9e\u4f53\u7684\u552f\u4e00\u6027\uff0c\u5373\u4e0d\u5b58\u5728\u90e8\u5206\u4f9d\u8d56\uff1b<\/li>\n\n\n\n
                • \u7b2c\u4e09\u65b9\u5f0f\uff1a\u5bf9\u5b57\u6bb5\u7684\u5197\u4f59\u6027\uff0c\u8981\u6c42\u4efb\u4f55\u5b57\u6bb5\u4e0d\u80fd\u7531\u5176\u4ed6\u5b57\u6bb5\u6d3e\u751f\u51fa\u6765\uff0c\u5b83\u8981\u6c42\u5b57\u6bb5\u6ca1\u6709\u5197\u4f59\uff0c\u5373\u4e0d\u5b58\u5728\u4f20\u9012\u4f9d\u8d56\uff1b<\/li>\n<\/ul>\n\n\n\n
                  \u6211\u4eec\u8bbe\u8ba1\u8868\u53ca\u5176\u5b57\u6bb5\u4e4b\u95f4\u7684\u5173\u7cfb, \u5e94\u5c3d\u91cf\u6ee1\u8db3\u7b2c\u4e09\u8303\u5f0f\u3002\u4f46\u662f\u6709\u65f6\u5019\uff0c\u53ef\u4ee5\u9002\u5f53\u5197\u4f59\uff0c\u6765\u63d0\u9ad8\u6548\u7387\u3002\u6bd4\u5982\u4ee5\u4e0b\u8fd9\u5f20\u8868<\/p>\n\n\n\n
                  \u5546\u54c1\u540d\u79f0<\/th>\u5546\u54c1\u578b\u53f7<\/th>\u5355\u4ef7<\/th>\u6570\u91cf<\/th>\u603b\u91d1\u989d<\/th><\/tr>
                  \u624b\u673a<\/td>\u534e\u4e3a<\/td>8000<\/td>5<\/td>40000<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                  \u4ee5\u4e0a\u8fd9\u5f20\u5b58\u653e\u5546\u54c1\u4fe1\u606f\u7684\u57fa\u672c\u8868\u3002\u603b\u91d1\u989d<\/code>\u8fd9\u4e2a\u5b57\u6bb5\u7684\u5b58\u5728\uff0c\u8868\u660e\u8be5\u8868\u7684\u8bbe\u8ba1\u4e0d\u6ee1\u8db3\u7b2c\u4e09\u8303\u5f0f\uff0c\u56e0\u4e3a\u603b\u91d1\u989d<\/code>\u53ef\u4ee5\u7531\u5355\u4ef7*\u6570\u91cf<\/code>\u5f97\u5230\uff0c\u8bf4\u660e\u603b\u91d1\u989d<\/code>\u662f\u5197\u4f59\u5b57\u6bb5\u3002\u4f46\u662f\uff0c\u589e\u52a0\u603b\u91d1\u989d<\/code>\u8fd9\u4e2a\u5197\u4f59\u5b57\u6bb5\uff0c\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u7edf\u8ba1\u7684\u901f\u5ea6\uff0c\u8fd9\u5c31\u662f\u4ee5\u7a7a\u95f4\u6362\u65f6\u95f4\u7684\u4f5c\u6cd5\u3002<\/p>\n\n\n\n
                  \u5f53\u7136\uff0c\u8fd9\u53ea\u662f\u4e2a\u5c0f\u4f8b\u5b50\u54c8\uff0c\u5927\u5bb6\u5f00\u53d1\u8bbe\u8ba1\u7684\u65f6\u5019\uff0c\u8981\u7ed3\u5408\u5177\u4f53\u4e1a\u52a1\u5206\u6790\u54c8\u3002<\/p>\n\n\n\n
                  11. \u907f\u514d\u4f7f\u7528MySQL\u4fdd\u7559\u5b57<\/h2>\n\n\n\n
                  \u5982\u679c\u5e93\u540d\u3001\u8868\u540d\u3001\u5b57\u6bb5\u540d\u7b49\u5c5e\u6027\u542b\u6709\u4fdd\u7559\u5b57\u65f6\uff0cSQL<\/code>\u8bed\u53e5\u5fc5\u987b\u7528\u53cd\u5f15\u53f7\u6765\u5f15\u7528\u5c5e\u6027\u540d\u79f0\uff0c\u8fd9\u5c06\u4f7f\u5f97SQL\u8bed\u53e5\u4e66\u5199\u3001SHELL\u811a\u672c\u4e2d\u53d8\u91cf\u7684\u8f6c\u4e49\u7b49\u53d8\u5f97\u975e\u5e38\u590d\u6742\u3002<\/p>\n\n\n\n
                  \u56e0\u6b64\uff0c\u6211\u4eec\u4e00\u822c\u907f\u514d\u4f7f\u7528MySQL<\/code>\u4fdd\u7559\u5b57\uff0c\u5982select\u3001interval\u3001desc<\/code>\u7b49\u7b49<\/p>\n\n\n\n
                  12. \u4e0d\u641e\u5916\u952e\u5173\u8054\uff0c\u4e00\u822c\u90fd\u5728\u4ee3\u7801\u7ef4\u62a4<\/h2>\n\n\n\n
                  \u4ec0\u4e48\u662f\u5916\u952e\u5462\uff1f<\/p>\n\n\n\n
                  \n
                  \u5916\u952e\uff0c\u4e5f\u53ebFOREIGN KEY<\/code>\uff0c\u5b83\u662f\u7528\u4e8e\u5c06\u4e24\u4e2a\u8868\u8fde\u63a5\u5728\u4e00\u8d77\u7684\u952e\u3002FOREIGN KEY<\/code>\u662f\u4e00\u4e2a\u8868\u4e2d\u7684\u4e00\u4e2a\u5b57\u6bb5\uff08\u6216\u5b57\u6bb5\u96c6\u5408\uff09\uff0c\u5b83\u5f15\u7528\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684PRIMARY KEY<\/code>\u3002\u5b83\u662f\u7528\u6765\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u7684\u3002<\/p>\n<\/blockquote>\n\n\n\n
                  \u963f\u91cc\u7684Java<\/code>\u89c4\u8303\u4e5f\u6709\u8fd9\u4e48\u4e00\u6761\uff1a<\/p>\n\n\n\n
                  \n
                  \u3010\u5f3a\u5236\u3011\u4e0d\u5f97\u4f7f\u7528\u5916\u952e\u4e0e\u7ea7\u8054<\/strong>\uff0c\u4e00\u5207\u5916\u952e\u6982\u5ff5\u5fc5\u987b\u5728\u5e94\u7528\u5c42\u89e3\u51b3\u3002<\/p>\n<\/blockquote>\n\n\n\n
                  \u6211\u4eec\u4e3a\u4ec0\u4e48\u4e0d\u63a8\u8350\u4f7f\u7528\u5916\u952e<\/strong>\u5462\uff1f<\/p>\n\n\n\n
                    \n
                  • \u4f7f\u7528\u5916\u952e\u5b58\u5728\u6027\u80fd\u95ee\u9898\u3001\u5e76\u53d1\u6b7b\u9501\u95ee\u9898\u3001\u4f7f\u7528\u8d77\u6765\u4e0d\u65b9\u4fbf\u7b49\u7b49\u3002\u6bcf\u6b21\u505aDELETE<\/code>\u6216\u8005UPDATE<\/code>\u90fd\u5fc5\u987b\u8003\u8651\u5916\u952e\u7ea6\u675f\uff0c\u4f1a\u5bfc\u81f4\u5f00\u53d1\u7684\u65f6\u5019\u5f88\u96be\u53d7,\u6d4b\u8bd5\u6570\u636e\u9020\u6570\u636e\u4e5f\u4e0d\u65b9\u4fbf\u3002<\/li>\n\n\n\n
                  • \u8fd8\u6709\u4e00\u4e2a\u573a\u666f\u4e0d\u80fd\u4f7f\u7528\u5916\u952e\uff0c\u5c31\u662f\u5206\u5e93\u5206\u8868\u3002<\/li>\n<\/ul>\n\n\n\n
                    13. \u4e00\u822c\u90fd\u9009\u62e9INNODB\u5b58\u50a8\u5f15\u64ce<\/h2>\n\n\n\n
                    \u5efa\u8868\u662f\u9700\u8981\u9009\u62e9\u5b58\u50a8\u5f15\u64ce<\/strong>\u7684\uff0c\u6211\u4eec\u4e00\u822c\u90fd\u9009\u62e9INNODB<\/code>\u5b58\u50a8\u5f15\u64ce\uff0c\u9664\u975e\u8bfb\u5199\u6bd4\u7387\u5c0f\u4e8e1%<\/code>, \u624d\u8003\u8651\u4f7f\u7528MyISAM<\/code> \u3002<\/p>\n\n\n\n
                    \u6709\u4e9b\u5c0f\u4f19\u4f34\u53ef\u80fd\u4f1a\u6709\u7591\u60d1\uff0c\u4e0d\u662f\u8fd8\u6709MEMORY<\/code>\u7b49\u5176\u4ed6\u5b58\u50a8\u5f15\u64ce\u5417\uff1f\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\u5b83\u5462\uff1f\u5176\u5b9e\u5176\u4ed6\u5b58\u50a8\u5f15\u64ce\u4e00\u822c\u9664\u4e86\u90fd\u5efa\u8bae\u5728DBA<\/code>\u7684\u6307\u5bfc\u4e0b\u4f7f\u7528\u3002<\/p>\n\n\n\n
                    \u6211\u4eec\u6765\u590d\u4e60\u4e00\u4e0b\u8fd9MySQL<\/code>\u8fd9\u4e09\u79cd\u5b58\u50a8\u5f15\u64ce\u7684\u5bf9\u6bd4\u533a\u522b\u5427\uff1a<\/p>\n\n\n\n
                    \u7279\u6027<\/th>INNODB<\/th>MyISAM<\/th>MEMORY<\/th><\/tr>
                    \u4e8b\u52a1\u5b89\u5168<\/td>\u652f\u6301<\/td>\u65e0<\/td>\u65e0<\/td><\/tr>
                    \u5b58\u50a8\u9650\u5236<\/td>64TB<\/td>\u6709<\/td>\u6709<\/td><\/tr>
                    \u7a7a\u95f4\u4f7f\u7528<\/td>\u9ad8<\/td>\u4f4e<\/td>\u4f4e<\/td><\/tr>
                    \u5185\u5b58\u4f7f\u7528<\/td>\u9ad8<\/td>\u4f4e<\/td>\u9ad8<\/td><\/tr>
                    \u63d2\u5165\u6570\u636e\u901f\u5ea6<\/td>\u4f4e<\/td>\u9ad8<\/td>\u9ad8<\/td><\/tr>
                    \u662f\u5426\u652f\u6301\u5916\u952e<\/td>\u652f\u6301<\/td>\u65e0<\/td>\u65e0<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                    14. \u9009\u62e9\u5408\u9002\u7edf\u4e00\u7684\u5b57\u7b26\u96c6\u3002<\/h2>\n\n\n\n
                    \u6570\u636e\u5e93\u5e93\u3001\u8868\u3001\u5f00\u53d1\u7a0b\u5e8f\u7b49\u90fd\u9700\u8981\u7edf\u4e00\u5b57\u7b26\u96c6\uff0c\u901a\u5e38\u4e2d\u82f1\u6587\u73af\u5883\u7528utf8<\/code>\u3002<\/p>\n\n\n\n
                    MySQL\u652f\u6301\u7684\u5b57\u7b26\u96c6\u6709utf8\u3001utf8mb4\u3001GBK\u3001latin1<\/code>\u7b49\u3002<\/p>\n\n\n\n
                      \n
                    • utf8\uff1a\u652f\u6301\u4e2d\u82f1\u6587\u6df7\u5408\u573a\u666f\uff0c\u56fd\u9645\u901a\u8fc7\uff0c3\u4e2a\u5b57\u8282\u957f\u5ea6<\/li>\n\n\n\n
                    • utf8mb4: \u5b8c\u5168\u517c\u5bb9utf8\uff0c4\u4e2a\u5b57\u8282\u957f\u5ea6\uff0c\u4e00\u822c\u5b58\u50a8emoji\u8868\u60c5<\/strong>\u9700\u8981\u7528\u5230\u5b83\u3002<\/li>\n\n\n\n
                    • GBK \uff1a\u652f\u6301\u4e2d\u6587\uff0c\u4f46\u662f\u4e0d\u652f\u6301\u56fd\u9645\u901a\u7528\u5b57\u7b26\u96c6\uff0c2\u4e2a\u5b57\u8282\u957f\u5ea6<\/li>\n\n\n\n
                    • latin1\uff1aMySQL\u9ed8\u8ba4\u5b57\u7b26\u96c6\uff0c1\u4e2a\u5b57\u8282\u957f\u5ea6<\/li>\n<\/ul>\n\n\n\n
                      15. \u5982\u679c\u4f60\u7684\u6570\u636e\u5e93\u5b57\u6bb5\u662f\u679a\u4e3e\u7c7b\u578b\u7684\uff0c\u9700\u8981\u5728comment\u6ce8\u91ca\u6e05\u695a<\/h2>\n\n\n\n
                      \u5982\u679c\u4f60\u8bbe\u8ba1\u7684\u6570\u636e\u5e93\u5b57\u6bb5\u662f\u679a\u4e3e\u7c7b\u578b\u7684\u8bdd\uff0c\u5c31\u9700\u8981\u5728comment<\/code>\u540e\u9762\u6ce8\u91ca\u6e05\u695a\u6bcf\u4e2a\u679a\u4e3e\u7684\u610f\u601d\uff0c\u4ee5\u4fbf\u4e8e\u7ef4\u62a4<\/p>\n\n\n\n
                      \u6b63\u4f8b\u5982\u4e0b\uff1a<\/p>\n\n\n\n
                      `session_status` varchar(2) COLLATE utf8_bin NOT NULL COMMENT 'session\u6388\u6743\u6001 00\uff1a\u5728\u7ebf-\u6388\u6743\u6001\u6709\u6548 01\uff1a\u4e0b\u7ebf-\u6388\u6743\u6001\u5931\u6548 02\uff1a\u4e0b\u7ebf-\u4e3b\u52a8\u9000\u51fa 03\uff1a\u4e0b\u7ebf-\u5728\u522b\u5904\u88ab\u767b\u5f55'<\/code><\/pre>\n\n\n\n
                      \u53cd\u4f8b\uff1a<\/p>\n\n\n\n
                      `session_status` varchar(2) COLLATE utf8_bin NOT NULL COMMENT 'session\u6388\u6743\u6001'<\/code><\/pre>\n\n\n\n
                      \u5e76\u4e14\uff0c\u5982\u679c\u4f60\u7684\u679a\u4e3e\u7c7b\u578b\u5728\u672a\u6765\u7684\u7248\u672c\u6709\u589e\u52a0\u4fee\u6539\u7684\u8bdd\uff0c\u4e5f\u9700\u8981\u540c\u65f6\u7ef4\u62a4\u5230comment<\/code>\u540e\u9762\u3002<\/p>\n\n\n\n
                      16.\u65f6\u95f4\u7684\u7c7b\u578b\u9009\u62e9<\/h2>\n\n\n\n
                      \u6211\u4eec\u8bbe\u8ba1\u8868\u7684\u65f6\u5019\uff0c\u4e00\u822c\u90fd\u9700\u8981\u52a0\u901a\u7528\u65f6\u95f4\u7684\u5b57\u6bb5\uff0c\u5982create_time\u3001modified_time<\/code>\u7b49\u7b49\u3002\u90a3\u5bf9\u4e8e\u65f6\u95f4\u7684\u7c7b\u578b\uff0c\u6211\u4eec\u8be5\u5982\u4f55\u9009\u62e9\u5462\uff1f<\/p>\n\n\n\n
                      \u5bf9\u4e8eMySQL\u6765\u8bf4\uff0c\u4e3b\u8981\u6709date\u3001datetime\u3001time\u3001timestamp \u548c year<\/code>\u3002<\/p>\n\n\n\n
                        \n
                      • date \uff1a\u8868\u793a\u7684\u65e5\u671f\u503c, \u683c\u5f0fyyyy-mm-dd<\/code>,\u8303\u56f41000-01-01 \u5230 9999-12-31<\/code>\uff0c3\u5b57\u8282<\/li>\n\n\n\n
                      • time \uff1a\u8868\u793a\u7684\u65f6\u95f4\u503c\uff0c\u683c\u5f0f hh:mm:ss<\/code>\uff0c\u8303\u56f4-838:59:59 \u5230 838:59:59<\/code>\uff0c3\u5b57\u8282<\/li>\n\n\n\n
                      • datetime\uff1a\u8868\u793a\u7684\u65e5\u671f\u65f6\u95f4\u503c\uff0c\u683c\u5f0fyyyy-mm-dd hh:mm:ss<\/code>\uff0c\u8303\u56f41000-01-01 00:00:00\u5230<\/code>9999-12-31 23:59:59“`,8\u5b57\u8282\uff0c\u8ddf\u65f6\u533a\u65e0\u5173<\/li>\n\n\n\n
                      • timestamp\uff1a\u8868\u793a\u7684\u65f6\u95f4\u6233\u503c\uff0c\u683c\u5f0f\u4e3ayyyymmddhhmmss<\/code>\uff0c\u8303\u56f41970-01-01 00:00:01\u52302038-01-19 03:14:07<\/code>\uff0c4\u5b57\u8282\uff0c\u8ddf\u65f6\u533a\u6709\u5173<\/li>\n\n\n\n
                      • year\uff1a\u5e74\u4efd\u503c\uff0c\u683c\u5f0f\u4e3ayyyy<\/code>\u3002\u8303\u56f41901\u52302155<\/code>\uff0c1\u5b57\u8282<\/li>\n<\/ul>\n\n\n\n
                        \u63a8\u8350\u4f18\u5148\u4f7f\u7528datetime<\/code>\u7c7b\u578b\u6765\u4fdd\u5b58\u65e5\u671f\u548c\u65f6\u95f4\uff0c\u56e0\u4e3a\u5b58\u50a8\u8303\u56f4\u66f4\u5927\uff0c\u4e14\u8ddf\u65f6\u533a\u65e0\u5173\u3002<\/p>\n\n\n\n
                        17. \u4e0d\u5efa\u8bae\u4f7f\u7528Stored procedure (\u5305\u62ec\u5b58\u50a8\u8fc7\u7a0b\uff0c\u89e6\u53d1\u5668) \u3002<\/h2>\n\n\n\n
                        \u4ec0\u4e48\u662f\u5b58\u50a8\u8fc7\u7a0b<\/strong><\/p>\n\n\n\n
                        \u5df2\u9884\u7f16\u8bd1\u4e3a\u4e00\u4e2a\u53ef\u6267\u884c\u8fc7\u7a0b\u7684\u4e00\u4e2a\u6216\u591a\u4e2aSQL\u8bed\u53e5\u3002<\/p>\n\n\n\n
                        \u4ec0\u4e48\u662f\u89e6\u53d1\u5668<\/strong><\/p>\n\n\n\n
                        \u89e6\u53d1\u5668\uff0c\u6307\u4e00\u6bb5\u4ee3\u7801\uff0c\u5f53\u89e6\u53d1\u67d0\u4e2a\u4e8b\u4ef6\u65f6\uff0c\u81ea\u52a8\u6267\u884c\u8fd9\u4e9b\u4ee3\u7801\u3002\u4f7f\u7528\u573a\u666f\uff1a<\/p>\n\n\n\n
                          \n
                        • \u53ef\u4ee5\u901a\u8fc7\u6570\u636e\u5e93\u4e2d\u7684\u76f8\u5173\u8868\u5b9e\u73b0\u7ea7\u8054\u66f4\u6539\u3002<\/li>\n\n\n\n
                        • \u5b9e\u65f6\u76d1\u63a7\u67d0\u5f20\u8868\u4e2d\u7684\u67d0\u4e2a\u5b57\u6bb5\u7684\u66f4\u6539\u800c\u9700\u8981\u505a\u51fa\u76f8\u5e94\u7684\u5904\u7406\u3002<\/li>\n\n\n\n
                        • \u4f8b\u5982\u53ef\u4ee5\u751f\u6210\u67d0\u4e9b\u4e1a\u52a1\u7684\u7f16\u53f7\u3002<\/li>\n\n\n\n
                        • \u6ce8\u610f\u4e0d\u8981\u6ee5\u7528\uff0c\u5426\u5219\u4f1a\u9020\u6210\u6570\u636e\u5e93\u53ca\u5e94\u7528\u7a0b\u5e8f\u7684\u7ef4\u62a4\u56f0\u96be\u3002<\/li>\n<\/ul>\n\n\n\n
                          \u5bf9\u4e8eMYSQL\u6765\u8bf4\uff0c\u5b58\u50a8\u8fc7\u7a0b\u3001\u89e6\u53d1\u5668\u7b49\u8fd8\u4e0d\u662f\u5f88\u6210\u719f\uff0c \u5e76\u6ca1\u6709\u5b8c\u5584\u7684\u51fa\u9519\u8bb0\u5f55\u5904\u7406\uff0c\u4e0d\u5efa\u8bae\u4f7f\u7528\u3002<\/p>\n\n\n\n
                          18. 1:N \u5173\u7cfb\u7684\u8bbe\u8ba1<\/h2>\n\n\n\n
                          \u65e5\u5e38\u5f00\u53d1\u4e2d\uff0c1<\/code>\u5bf9\u591a\u7684\u5173\u7cfb\u5e94\u8be5\u662f\u975e\u5e38\u5e38\u89c1\u7684\u3002\u6bd4\u5982\u4e00\u4e2a\u73ed\u7ea7\u6709\u591a\u4e2a\u5b66\u751f\uff0c\u4e00\u4e2a\u90e8\u95e8\u6709\u591a\u4e2a\u5458\u5de5\u7b49\u7b49\u3002\u8fd9\u79cd\u7684\u5efa\u8868\u539f\u5219\u5c31\u662f\uff1a\u5728\u4ece\u8868\uff08N<\/code>\u7684\u8fd9\u4e00\u65b9\uff09\u521b\u5efa\u4e00\u4e2a\u5b57\u6bb5\uff0c\u4ee5\u5b57\u6bb5\u4f5c\u4e3a\u5916\u952e\u6307\u5411\u4e3b\u8868\uff081<\/code>\u7684\u8fd9\u4e00\u65b9\uff09\u7684\u4e3b\u952e\u3002\u793a\u610f\u56fe\u5982\u4e0b:<\/p>\n\n\n\n
                          \"\"\/<\/figure>\n\n\n\n
                          \u5b66\u751f\u8868\u662f\u591a\uff08N<\/code>\uff09\u7684\u4e00\u65b9\uff0c\u4f1a\u6709\u4e2a\u5b57\u6bb5class_id<\/code>\u4fdd\u5b58\u73ed\u7ea7\u8868\u7684\u4e3b\u952e\u3002\u5f53\u7136\uff0c\u4e00\u73ed\u4e0d\u52a0\u5916\u952e\u7ea6\u675f\u54c8\uff0c\u53ea\u662f\u5355\u7eaf\u4fdd\u5b58\u8fd9\u4e2a\u5173\u7cfb\u800c\u5df2\u3002<\/p>\n\n\n\n
                          \u6709\u65f6\u5019\u4e24\u5f20\u8868\u5b58\u5728N:N<\/code>\u5173\u7cfb\u65f6\uff0c\u6211\u4eec\u5e94\u8be5\u6d88\u9664\u8fd9\u79cd\u5173\u7cfb\u3002\u901a\u8fc7\u589e\u52a0\u7b2c\u4e09\u5f20\u8868\uff0c\u628aN:N<\/code>\u4fee\u6539\u4e3a\u4e24\u4e2a 1:N<\/code>\u3002\u6bd4\u5982\u56fe\u4e66\u548c\u8bfb\u8005\uff0c\u662f\u4e00\u4e2a\u5178\u578b\u7684\u591a\u5bf9\u591a\u7684\u5173\u7cfb\u3002\u4e00\u672c\u4e66\u53ef\u4ee5\u88ab\u591a\u4e2a\u8bfb\u8005\u501f\uff0c\u4e00\u4e2a\u8bfb\u8005\u53c8\u53ef\u4ee5\u501f\u591a\u672c\u4e66\u3002\u6211\u4eec\u5c31\u53ef\u4ee5\u8bbe\u8ba1\u4e00\u4e2a\u501f\u4e66\u8868\uff0c\u5305\u542b\u56fe\u4e66\u8868\u7684\u4e3b\u952e\uff0c\u4ee5\u53ca\u8bfb\u8005\u7684\u4e3b\u952e\uff0c\u4ee5\u53ca\u501f\u8fd8\u6807\u8bb0\u7b49\u5b57\u6bb5\u3002<\/p>\n\n\n\n
                          19. \u5927\u5b57\u6bb5<\/h2>\n\n\n\n
                          \u8bbe\u8ba1\u8868\u7684\u65f6\u5019\uff0c\u6211\u4eec\u5c24\u5176\u9700\u8981\u5173\u6ce8\u4e00\u4e9b\u5927\u5b57\u6bb5\uff0c\u5373\u5360\u7528\u8f83\u591a\u5b58\u50a8\u7a7a\u95f4\u7684\u5b57\u6bb5\u3002\u6bd4\u5982\u7528\u6765\u8bb0\u5f55\u7528\u6237\u8bc4\u8bba\u7684\u5b57\u6bb5\uff0c\u53c8\u6216\u8005\u8bb0\u5f55\u535a\u5ba2\u5185\u5bb9\u7684\u5b57\u6bb5\uff0c\u53c8\u6216\u8005\u4fdd\u5b58\u5408\u540c\u6570\u636e\u7684\u5b57\u6bb5\u3002\u5982\u679c\u76f4\u63a5\u628a\u8868\u5b57\u6bb5\u8bbe\u8ba1\u6210text\u7c7b\u578b\u7684\u8bdd\uff0c\u5c31\u4f1a\u6d6a\u8d39\u5b58\u50a8\u7a7a\u95f4\uff0c\u67e5\u8be2\u6548\u7387\u4e5f\u4e0d\u597d\u3002<\/p>\n\n\n\n
                          \u5728MySQl\u4e2d\uff0c\u8fd9\u79cd\u65b9\u5f0f\u4fdd\u5b58\u7684\u8bbe\u8ba1\u65b9\u6848\uff0c\u5176\u5b9e\u662f\u4e0d\u592a\u5408\u7406\u7684\u3002\u8fd9\u79cd\u975e\u5e38\u5927\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u4fdd\u5b58\u5230mongodb<\/code>\u4e2d\uff0c\u7136\u540e\uff0c\u5728\u4e1a\u52a1\u8868\u4fdd\u5b58\u5bf9\u5e94mongodb<\/code>\u7684id<\/code>\u5373\u53ef\u3002<\/p>\n\n\n\n
                          \u8fd9\u79cd\u8bbe\u8ba1\u601d\u60f3\u7c7b\u4f3c\u4e8e\uff0c\u6211\u4eec\u8868\u5b57\u6bb5\u4fdd\u5b58\u56fe\u7247\u65f6\uff0c\u4e3a\u4ec0\u4e48\u4e0d\u662f\u4fdd\u5b58\u56fe\u7247\u5185\u5bb9\uff0c\u800c\u662f\u76f4\u63a5\u4fdd\u5b58\u56fe\u7247url\u5373\u53ef\u3002<\/p>\n\n\n\n
                          20. \u8003\u8651\u662f\u5426\u9700\u8981\u5206\u5e93\u5206\u8868<\/h2>\n\n\n\n
                          \u4ec0\u4e48\u662f\u5206\u5e93\u5206\u8868\u5462\uff1f<\/strong><\/p>\n\n\n\n
                            \n
                          • \u5206\u5e93\uff1a\u5c31\u662f\u4e00\u4e2a\u6570\u636e\u5e93\u5206\u6210\u591a\u4e2a\u6570\u636e\u5e93\uff0c\u90e8\u7f72\u5230\u4e0d\u540c\u673a\u5668\u3002<\/li>\n<\/ul>\n\n\n\n
                            \"\"\/<\/figure>\n\n\n\n
                              \n
                            • \u5206\u8868\uff1a\u5c31\u662f\u4e00\u4e2a\u6570\u636e\u5e93\u8868\u5206\u6210\u591a\u4e2a\u8868\u3002<\/li>\n<\/ul>\n\n\n\n
                              \"\"\/<\/figure>\n\n\n\n
                              \u6211\u4eec\u5728\u8bbe\u8ba1\u8868\u7684\u65f6\u5019\uff0c\u5176\u5b9e\u53ef\u4ee5\u63d0\u524d\u4f30\u7b97\u4e00\u4e0b\uff0c\u662f\u5426\u9700\u8981\u505a\u5206\u5e93\u5206\u8868<\/strong>\u3002\u6bd4\u5982\u4e00\u4e9b\u7528\u6237\u4fe1\u606f\uff0c\u672a\u6765\u53ef\u80fd\u6570\u636e\u91cf\u5230\u8fbe\u767e\u4e07\u8bbe\u7f6e\u5343\u4e07\u7684\u8bdd\uff0c\u5c31\u53ef\u4ee5\u63d0\u524d\u8003\u8651\u5206\u5e93\u5206\u8868\u3002<\/p>\n\n\n\n
                              \n
                              \u4e3a\u4ec0\u4e48\u9700\u8981\u5206\u5e93\u5206\u8868<\/strong>: \u6570\u636e\u91cf\u592a\u5927\u7684\u8bdd\uff0cSQL\u7684\u67e5\u8be2\u5c31\u4f1a\u53d8\u6162\u3002\u5982\u679c\u4e00\u4e2a\u67e5\u8be2SQL\u6ca1\u547d\u4e2d\u7d22\u5f15\uff0c\u5343\u767e\u4e07\u6570\u636e\u91cf\u7ea7\u522b\u7684\u8868\u53ef\u80fd\u4f1a\u62d6\u57ae\u6574\u4e2a\u6570\u636e\u5e93\u3002\u5373\u4f7fSQL\u547d\u4e2d\u4e86\u7d22\u5f15\uff0c\u5982\u679c\u8868\u7684\u6570\u636e\u91cf\u8d85\u8fc7\u4e00\u5343\u4e07\u7684\u8bdd\uff0c\u67e5\u8be2\u4e5f\u662f\u4f1a\u660e\u663e\u53d8\u6162\u7684\u3002\u8fd9\u662f\u56e0\u4e3a\u7d22\u5f15\u4e00\u822c\u662fB+\u6811\u7ed3\u6784\uff0c\u6570\u636e\u5343\u4e07\u7ea7\u522b\u7684\u8bdd\uff0cB+\u6811\u7684\u9ad8\u5ea6\u4f1a\u589e\u9ad8\uff0c\u67e5\u8be2\u5c31\u53d8\u6162\u5566\u3002<\/p>\n<\/blockquote>\n\n\n\n
                              \u5206\u5e93\u5206\u8868\u4e3b\u8981\u6709\u6c34\u5e73\u62c6\u5206\u3001\u5782\u76f4\u62c6\u5206\u7684\u8bf4\u6cd5\uff0c\u62c6\u5206\u7b56\u7565\u6709range\u8303\u56f4\u3001hash\u53d6\u6a21<\/code>\u3002\u800c\u5206\u5e93\u5206\u8868\u4e3b\u8981\u6709\u8fd9\u4e9b\u95ee\u9898\uff1a<\/p>\n\n\n\n
                                \n
                              • \u4e8b\u52a1\u95ee\u9898<\/li>\n\n\n\n
                              • \u8de8\u5e93\u5173\u8054<\/li>\n\n\n\n
                              • \u6392\u5e8f\u95ee\u9898<\/li>\n\n\n\n
                              • \u5206\u9875\u95ee\u9898<\/li>\n\n\n\n
                              • \u5206\u5e03\u5f0fID<\/li>\n<\/ul>\n\n\n\n
                                21. sqL \u7f16\u5199\u7684\u4e00\u4e9b\u4f18\u5316\u7ecf\u9a8c<\/h2>\n\n\n\n
                                \u6700\u540e\u7684\u8bdd\uff0c\u8ddf\u5927\u5bb6\u804a\u6765\u4e00\u4e9b\u5199SQL\u7684\u7ecf\u9a8c\u5427\uff1a<\/p>\n\n\n\n
                                  \n
                                • \u67e5\u8be2SQL\u5c3d\u91cf\u4e0d\u8981\u4f7f\u7528select *<\/code>\uff0c\u800c\u662fselect<\/code>\u5177\u4f53\u5b57\u6bb5<\/li>\n\n\n\n
                                • \u5982\u679c\u77e5\u9053\u67e5\u8be2\u7ed3\u679c\u53ea\u6709\u4e00\u6761\u6216\u8005\u53ea\u8981\u6700\u5927\/\u6700\u5c0f\u4e00\u6761\u8bb0\u5f55\uff0c\u5efa\u8bae\u7528limit 1<\/code><\/li>\n\n\n\n
                                • \u5e94\u5c3d\u91cf\u907f\u514d\u5728where<\/code>\u5b50\u53e5\u4e2d\u4f7f\u7528or<\/code>\u6765\u8fde\u63a5\u6761\u4ef6<\/li>\n\n\n\n
                                • \u6ce8\u610f\u4f18\u5316limit<\/code>\u6df1\u5206\u9875\u95ee\u9898<\/li>\n\n\n\n
                                • \u4f7f\u7528where<\/code>\u6761\u4ef6\u9650\u5b9a\u8981\u67e5\u8be2\u7684\u6570\u636e\uff0c\u907f\u514d\u8fd4\u56de\u591a\u4f59\u7684\u884c<\/li>\n\n\n\n
                                • \u5c3d\u91cf\u907f\u514d\u5728\u7d22\u5f15\u5217\u4e0a\u4f7f\u7528mysql<\/code>\u7684\u5185\u7f6e\u51fd\u6570<\/li>\n\n\n\n
                                • \u5e94\u5c3d\u91cf\u907f\u514d\u5728 where<\/code>\u5b50\u53e5\u4e2d\u5bf9\u5b57\u6bb5\u8fdb\u884c\u8868\u8fbe\u5f0f\u64cd\u4f5c<\/li>\n\n\n\n
                                • \u5e94\u5c3d\u91cf\u907f\u514d\u5728where<\/code> \u5b50\u53e5\u4e2d\u4f7f\u7528!=<\/code>\u6216<><\/code>\u64cd\u4f5c\u7b26<\/li>\n\n\n\n
                                • \u4f7f\u7528\u8054\u5408\u7d22\u5f15\u65f6\uff0c\u6ce8\u610f\u7d22\u5f15\u5217\u7684\u987a\u5e8f\uff0c\u4e00\u822c\u9075\u5faa\u6700\u5de6\u5339\u914d\u539f\u5219\u3002<\/li>\n\n\n\n
                                • \u5bf9\u67e5\u8be2\u8fdb\u884c\u4f18\u5316\uff0c\u5e94\u8003\u8651\u5728where \u53ca order by<\/code>\u6d89\u53ca\u7684\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15<\/li>\n\n\n\n
                                • \u5982\u679c\u63d2\u5165\u6570\u636e\u8fc7\u591a\uff0c\u8003\u8651\u6279\u91cf\u63d2\u5165<\/li>\n\n\n\n
                                • \u5728\u9002\u5f53\u7684\u65f6\u5019\uff0c\u4f7f\u7528\u8986\u76d6\u7d22\u5f15<\/li>\n\n\n\n
                                • \u4f7f\u7528explain \u5206\u6790\u4f60SQL\u7684\u8ba1\u5212<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
                                  \u539f\u6587\uff1a21\u4e2aMySQL\u8868\u8bbe\u8ba1\u7684\u7ecf\u9a8c\u51c6\u5219 – \u77e5\u4e4e (zhihu.com) 1.\u547d\u540d\u89c4\u8303 \u6570\u636e\u5e93\u8868\u540d […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[62],"_links":{"self":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4336"}],"collection":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4336"}],"version-history":[{"count":1,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4336\/revisions"}],"predecessor-version":[{"id":4337,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4336\/revisions\/4337"}],"wp:attachment":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}