{"id":70412,"date":"2026-02-01T22:58:04","date_gmt":"2026-02-01T14:58:04","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/70412.html"},"modified":"2026-02-01T22:58:04","modified_gmt":"2026-02-01T14:58:04","slug":"%e3%80%90mysql%e5%9f%ba%e7%a1%80%e8%af%ad%e6%b3%95%e6%80%bb%e7%bb%93%e3%80%91","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/70412.html","title":{"rendered":"\u3010MYSQL\u57fa\u7840\u8bed\u6cd5\u603b\u7ed3\u3011"},"content":{"rendered":"

SQL\u8bed\u53e5<\/span><\/h2>\n

SQL：\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\u3002\u4e00\u95e8\u64cd\u4f5c\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u7f16\u7a0b\u8bed\u8a00，\u5b9a\u4e49\u64cd\u4f5c\u6240\u6709\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u7edf\u4e00\u6807\u51c6\u3002SQL\u8bed\u53e5\u6839\u636e\u5176\u529f\u80fd\u88ab\u5206\u4e3a\u56db\u5927\u7c7b：DDL\u3001DML\u3001DQL\u3001DCL \u3002<\/p>\n\n\n\n\n\n\n\n
\n

\u5206\u7c7b<\/span><\/p>\n<\/td>\n

\n

\u5168\u79f0<\/span><\/p>\n<\/td>\n

\n

\u8bf4\u660e<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

DDL<\/span><\/p>\n<\/td>\n

\n

Data Definition Language<\/span><\/p>\n<\/td>\n

\n

\u6570\u636e\u5b9a\u4e49\u8bed\u8a00，\u7528\u6765\u5b9a\u4e49\u6570\u636e\u5e93\u5bf9\u8c61(\u6570\u636e\u5e93，\u8868，\u5b57\u6bb5)<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

DML<\/span><\/p>\n<\/td>\n

\n

Data Manipulation Language<\/span><\/p>\n<\/td>\n

\n

\u6570\u636e\u64cd\u4f5c\u8bed\u8a00，\u7528\u6765\u5bf9\u6570\u636e\u5e93\u8868\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u589e\u5220\u6539<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

DQL<\/span><\/p>\n<\/td>\n

\n

Data Query Language<\/span><\/p>\n<\/td>\n

\n

\u6570\u636e\u67e5\u8be2\u8bed\u8a00，\u7528\u6765\u67e5\u8be2\u6570\u636e\u5e93\u4e2d\u8868\u7684\u8bb0\u5f55<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

DCL<\/span><\/p>\n<\/td>\n

\n

Data Control Language<\/span><\/p>\n<\/td>\n

\n

\u6570\u636e\u63a7\u5236\u8bed\u8a00，\u7528\u6765\u521b\u5efa\u6570\u636e\u5e93\u7528\u6237\u3001\u63a7\u5236\u6570\u636e\u5e93\u7684\u8bbf\u95ee\u6743\u9650<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\n

\"\"<\/p>\n

\n

DDL\u8bed\u53e5<\/span><\/h3>\n

\u6570\u636e\u5e93\u64cd\u4f5c<\/span><\/h4>\n

\u6211\u4eec\u5728\u8fdb\u884c\u6570\u636e\u5e93\u8bbe\u8ba1，\u9700\u8981\u4f7f\u7528\u5230\u521a\u624d\u6240\u4ecb\u7ecdSQL\u5206\u7c7b\u4e2d\u7684DDL\u8bed\u53e5\u3002<\/p>\n

DDL\u82f1\u6587\u5168\u79f0\u662fData Definition Language(\u6570\u636e\u5b9a\u4e49\u8bed\u8a00)，\u7528\u6765\u5b9a\u4e49\u6570\u636e\u5e93\u5bf9\u8c61(\u6570\u636e\u5e93\u3001\u8868)\u3002<\/p>\n

DDL\u4e2d\u6570\u636e\u5e93\u7684\u5e38\u89c1\u64cd\u4f5c：\u67e5\u8be2\u3001\u521b\u5efa\u3001\u4f7f\u7528\u3001\u5220\u9664\u3002<\/p>\n

\n

\u67e5\u8be2\u6570\u636e\u5e93<\/span><\/h5>\n
    \n
  • \u67e5\u8be2\u6240\u6709\u6570\u636e\u5e93<\/li>\n<\/ul>\n

    \"\"<\/p>\n

    \n

      \n
    • \u67e5\u8be2\u5f53\u524d\u6570\u636e\u5e93<\/li>\n<\/ul>\n

      \"\"<\/p>\n

      \n

      \u521b\u5efa\u6570\u636e\u5e93<\/span><\/h5>\n
        \n
      • \u8bed\u6cd5：<\/li>\n<\/ul>\n

        \"\"<\/p>\n

        \n

        \u00a0\u4f7f\u7528\u6570\u636e\u5e93<\/span><\/h5>\n
          \n
        • \u8bed\u6cd5：<\/li>\n<\/ul>\n

          \"\"<\/p>\n

          \n

          \u5220\u9664\u6570\u636e\u5e93<\/span><\/h5>\n
            \n
          • \u8bed\u6cd5:<\/li>\n<\/ul>\n

            \"\"<\/p>\n

            \n

            \n

            \u8868\u64cd\u4f5c<\/span><\/h4>\n

            \u5305\u542b\u56db\u4e2a\u90e8\u5206：\u521b\u5efa\u8868\u3001\u67e5\u8be2\u8868\u3001\u4fee\u6539\u8868\u3001\u5220\u9664\u8868\u3002<\/p>\n

            \n

            \n

            \u521b\u5efa<\/span><\/h5>\n
              \n
            • \u8bed\u6cd5：<\/li>\n<\/ul>\n

              \"\"<\/p>\n

                \n
              • \u6ce8\u610f： [ ] \u4e2d\u7684\u5185\u5bb9\u4e3a\u53ef\u9009\u53c2\u6570； \u6700\u540e\u4e00\u4e2a\u5b57\u6bb5\u540e\u9762\u6ca1\u6709\u9017\u53f7<\/li>\n<\/ul>\n

                \n

                \u8868\u64cd\u4f5c-\u5176\u4ed6\u64cd\u4f5c<\/span><\/h5>\n

                （<\/span>\u53ef\u4ee5\u8df3\u8fc7，\u76f4\u63a5\u770b\u540e\u9762\u7684\u7eff\u8272\u6587\u5b57<\/span>）<\/span><\/p>\n

                \u8868\u7ed3\u6784\u7684\u67e5\u8be2\u3001\u4fee\u6539\u3001\u5220\u9664\u64cd\u4f5c<\/p>\n

                \n

                \"\"<\/p>\n

                \n

                  \n
                • \u4fee\u6539\u6570\u636e\u5e93\u8868\u7ed3\u6784\u7684\u5177\u4f53\u8bed\u6cd5：<\/li>\n<\/ul>\n

                  \u6dfb\u52a0\u5b57\u6bb5<\/p>\n

                  \n

                  \"\"<\/p>\n

                  \n

                  \u4fee\u6539\u5b57\u6bb5<\/p>\n

                  \"\"<\/p>\n

                  \n

                  \u5220\u9664\u5b57\u6bb5<\/p>\n

                  \"\"<\/p>\n

                  \n

                  \u4fee\u6539\u8868\u540d<\/p>\n

                  \"\"<\/p>\n

                  \n

                  \u5220\u9664\u8868\u7ed3\u6784<\/p>\n

                  \"\"<\/p>\n

                  \u5173\u4e8e\u8868\u7ed3\u6784\u7684\u67e5\u770b\u3001\u4fee\u6539\u3001\u5220\u9664\u64cd\u4f5c，\u5de5\u4f5c\u4e2d\u4e00\u822c\u90fd\u662f\u76f4\u63a5\u57fa\u4e8e\u56fe\u5f62\u5316\u754c\u9762\u64cd\u4f5c\u3002 <\/span><\/p>\n

                  \"\"<\/p>\n<\/p>\n

                  \u7ea6\u675f<\/span><\/h3>\n
                    \n
                  • \u6982\u5ff5：\u6240\u8c13\u7ea6\u675f\u5c31\u662f\u4f5c\u7528\u5728\u8868\u4e2d\u5b57\u6bb5\u4e0a\u7684\u89c4\u5219，\u7528\u4e8e\u9650\u5236\u5b58\u50a8\u5728\u8868\u4e2d\u7684\u6570\u636e\u3002<\/li>\n
                  • \u4f5c\u7528：\u5c31\u662f\u6765\u4fdd\u8bc1\u6570\u636e\u5e93\u5f53\u4e2d\u6570\u636e\u7684\u6b63\u786e\u6027\u3001\u6709\u6548\u6027\u548c\u5b8c\u6574\u6027\u3002（\u540e\u9762\u7684\u5b66\u4e60\u4f1a\u9a8c\u8bc1\u8fd9\u4e9b）<\/li>\n
                  • \u5728MySQL\u6570\u636e\u5e93\u5f53\u4e2d，\u63d0\u4f9b\u4e86\u4ee5\u4e0b5\u79cd\u7ea6\u675f：<\/li>\n<\/ul>\n\n\n\n\n\n\n\n\n
                    \n

                    \u7ea6\u675f<\/span><\/p>\n<\/td>\n

                    		\n

                    \u63cf\u8ff0<\/span><\/p>\n<\/td>\n

                    		\n

                    \u5173\u952e\u5b57<\/span><\/p>\n<\/td>\n<\/tr>\n

                    \n

                    \u975e\u7a7a\u7ea6\u675f<\/span><\/p>\n<\/td>\n

                    		\n

                    \u9650\u5236\u8be5\u5b57\u6bb5\u503c\u4e0d\u80fd\u4e3anull<\/span><\/p>\n<\/td>\n

                    		\n

                    not null<\/span><\/p>\n<\/td>\n<\/tr>\n

                    \n

                    \u552f\u4e00\u7ea6\u675f<\/span><\/p>\n<\/td>\n

                    		\n

                    \u4fdd\u8bc1\u5b57\u6bb5\u7684\u6240\u6709\u6570\u636e\u90fd\u662f\u552f\u4e00\u3001\u4e0d\u91cd\u590d\u7684<\/span><\/p>\n<\/td>\n

                    		\n

                    unique<\/span><\/p>\n<\/td>\n<\/tr>\n

                    \n

                    \u4e3b\u952e\u7ea6\u675f<\/span><\/p>\n<\/td>\n

                    		\n

                    \u4e3b\u952e\u662f\u4e00\u884c\u6570\u636e\u7684\u552f\u4e00\u6807\u8bc6，\u8981\u6c42\u975e\u7a7a\u4e14\u552f\u4e00<\/span><\/p>\n<\/td>\n

                    		\n

                    primary key<\/span><\/p>\n<\/td>\n<\/tr>\n

                    \n

                    \u9ed8\u8ba4\u7ea6\u675f<\/span><\/p>\n<\/td>\n

                    		\n

                    \u4fdd\u5b58\u6570\u636e\u65f6，\u5982\u679c\u672a\u6307\u5b9a\u8be5\u5b57\u6bb5\u503c，\u5219\u91c7\u7528\u9ed8\u8ba4\u503c<\/span><\/p>\n<\/td>\n

                    		\n

                    default<\/span><\/p>\n<\/td>\n<\/tr>\n

                    \n

                    \u5916\u952e\u7ea6\u675f<\/span><\/p>\n<\/td>\n

                    		\n

                    \u8ba9\u4e24\u5f20\u8868\u7684\u6570\u636e\u5efa\u7acb\u8fde\u63a5，\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027<\/span><\/p>\n<\/td>\n

                    		\n

                    foreign key<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                    \u6ce8\u610f：\u7ea6\u675f\u662f\u4f5c\u7528\u4e8e\u8868\u4e2d\u5b57\u6bb5\u4e0a\u7684，\u53ef\u4ee5\u5728\u521b\u5efa\u8868\/\u4fee\u6539\u8868\u7684\u65f6\u5019\u6dfb\u52a0\u7ea6\u675f\u3002<\/span><\/p>\n

                    \n

                    \u4e3b\u952e\u81ea\u589e：auto_increment<\/span><\/p>\n

                      \n
                    • \u6bcf\u6b21\u63d2\u5165\u65b0\u7684\u884c\u8bb0\u5f55\u65f6，\u6570\u636e\u5e93\u81ea\u52a8\u751f\u6210id\u5b57\u6bb5(\u4e3b\u952e)\u4e0b\u7684\u503c<\/li>\n
                    • \u5177\u6709auto_increment\u7684\u6570\u636e\u5217\u662f\u4e00\u4e2a\u6b63\u6570\u5e8f\u5217\u5f00\u59cb\u589e\u957f(\u4ece1\u5f00\u59cb\u81ea\u589e)<\/li>\n<\/ul>\n<\/p>\n

                      \u6570\u636e\u7c7b\u578b<\/span><\/h3>\n

                      \u4e3b\u8981\u5206\u4e3a\u4e09\u7c7b：\u6570\u503c\u7c7b\u578b\u3001\u5b57\u7b26\u4e32\u7c7b\u578b\u3001\u65e5\u671f\u65f6\u95f4\u7c7b\u578b\u3002<\/p>\n

                      \n

                      1). \u6570\u503c\u7c7b\u578b<\/span><\/h4>\n\n\n\n\n\n\n\n\n\n\n\n
                      \n

                      \u7c7b\u578b<\/span><\/p>\n<\/td>\n

                      		\n

                      \u5927\u5c0f<\/span><\/p>\n<\/td>\n

                      		\n

                      \u6709\u7b26\u53f7(SIGNED)\u8303\u56f4<\/span><\/p>\n<\/td>\n

                      		\n

                      \u65e0\u7b26\u53f7(UNSIGNED)\u8303\u56f4<\/span><\/p>\n<\/td>\n

                      		\n

                      \u63cf\u8ff0<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      TINYINT<\/span><\/p>\n<\/td>\n

                      		\n

                      1byte<\/span><\/p>\n<\/td>\n

                      		\n

                      (-128，127)<\/span><\/p>\n<\/td>\n

                      		\n

                      (0，255)<\/span><\/p>\n<\/td>\n

                      		\n

                      \u5c0f\u6574\u6570\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      SMALLINT<\/span><\/p>\n<\/td>\n

                      		\n

                      2bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      (-32768，32767)<\/span><\/p>\n<\/td>\n

                      		\n

                      (0，65535)<\/span><\/p>\n<\/td>\n

                      		\n

                      \u5927\u6574\u6570\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      MEDIUMINT<\/span><\/p>\n<\/td>\n

                      		\n

                      3bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      (-8388608，8388607)<\/span><\/p>\n<\/td>\n

                      		\n

                      (0，16777215)<\/span><\/p>\n<\/td>\n

                      		\n

                      \u5927\u6574\u6570\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      INT\/INTEGER<\/span><\/p>\n<\/td>\n

                      		\n

                      4bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      (-2147483648，2147483647)<\/span><\/p>\n<\/td>\n

                      		\n

                      (0，4294967295)<\/span><\/p>\n<\/td>\n

                      		\n

                      \u5927\u6574\u6570\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      BIGINT<\/span><\/p>\n<\/td>\n

                      		\n

                      8bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      (-2^63，2^63-1)<\/span><\/p>\n<\/td>\n

                      		\n

                      (0，2^64-1)<\/span><\/p>\n<\/td>\n

                      		\n

                      \u6781\u5927\u6574\u6570\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      FLOAT<\/span><\/p>\n<\/td>\n

                      		\n

                      4bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      (-3.402823466 E+38，3.402823466351 E+38)<\/span><\/p>\n<\/td>\n

                      		\n

                      0 \u548c (1.175494351 E-38，3.402823466 E+38)<\/span><\/p>\n<\/td>\n

                      		\n

                      \u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      DOUBLE<\/span><\/p>\n<\/td>\n

                      		\n

                      8bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      (-1.7976931348623157 E+308，1.7976931348623157 E+308)<\/span><\/p>\n<\/td>\n

                      		\n

                      0 \u548c (2.2250738585072014 E-308，1.7976931348623157 E+308)<\/span><\/p>\n<\/td>\n

                      		\n

                      \u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      DECIMAL<\/span><\/p>\n<\/td>\n

                      		\n

                      \n<\/td>\n

                      		\n

                      \u4f9d\u8d56\u4e8eM(\u7cbe\u5ea6)\u548cD(\u6807\u5ea6)\u7684\u503c<\/span><\/p>\n<\/td>\n

                      		\n

                      \u4f9d\u8d56\u4e8eM(\u7cbe\u5ea6)\u548cD(\u6807\u5ea6)\u7684\u503c<\/span><\/p>\n<\/td>\n

                      		\n

                      \u5c0f\u6570\u503c(\u7cbe\u786e\u5b9a\u70b9\u6570)<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                      \n

                      \"\"<\/p>\n

                      2). \u5b57\u7b26\u4e32\u7c7b\u578b<\/span><\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
                      \n

                      \u7c7b\u578b<\/span><\/p>\n<\/td>\n

                      		\n

                      \u5927\u5c0f<\/span><\/p>\n<\/td>\n

                      		\n

                      \u63cf\u8ff0<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      CHAR<\/span><\/p>\n<\/td>\n

                      		\n

                      0-255 bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      \u5b9a\u957f\u5b57\u7b26\u4e32(\u9700\u8981\u6307\u5b9a\u957f\u5ea6)<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      VARCHAR<\/span><\/p>\n<\/td>\n

                      		\n

                      0-65535 bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      \u53d8\u957f\u5b57\u7b26\u4e32(\u9700\u8981\u6307\u5b9a\u957f\u5ea6)<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      TINYBLOB<\/span><\/p>\n<\/td>\n

                      		\n

                      0-255 bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      \u4e0d\u8d85\u8fc7255\u4e2a\u5b57\u7b26\u7684\u4e8c\u8fdb\u5236\u6570\u636e<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      TINYTEXT<\/span><\/p>\n<\/td>\n

                      		\n

                      0-255 bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      \u77ed\u6587\u672c\u5b57\u7b26\u4e32<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      BLOB<\/span><\/p>\n<\/td>\n

                      		\n

                      0-65 535 bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      \u4e8c\u8fdb\u5236\u5f62\u5f0f\u7684\u957f\u6587\u672c\u6570\u636e<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      TEXT<\/span><\/p>\n<\/td>\n

                      		\n

                      0-65 535 bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      \u957f\u6587\u672c\u6570\u636e<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      MEDIUMBLOB<\/span><\/p>\n<\/td>\n

                      		\n

                      0-16 777 215 bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      \u4e8c\u8fdb\u5236\u5f62\u5f0f\u7684\u4e2d\u7b49\u957f\u5ea6\u6587\u672c\u6570\u636e<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      MEDIUMTEXT<\/span><\/p>\n<\/td>\n

                      		\n

                      0-16 777 215 bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      \u4e2d\u7b49\u957f\u5ea6\u6587\u672c\u6570\u636e<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      LONGBLOB<\/span><\/p>\n<\/td>\n

                      		\n

                      0-4 294 967 295 bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      \u4e8c\u8fdb\u5236\u5f62\u5f0f\u7684\u6781\u5927\u6587\u672c\u6570\u636e<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      LONGTEXT<\/span><\/p>\n<\/td>\n

                      		\n

                      0-4 294 967 295 bytes<\/span><\/p>\n<\/td>\n

                      		\n

                      \u6781\u5927\u6587\u672c\u6570\u636e<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                      char \u4e0e varchar \u90fd\u53ef\u4ee5\u63cf\u8ff0\u5b57\u7b26\u4e32，char\u662f\u5b9a\u957f\u5b57\u7b26\u4e32，\u6307\u5b9a\u957f\u5ea6\u591a\u957f，\u5c31\u5360\u7528\u591a\u5c11\u4e2a\u5b57\u7b26，\u548c\u5b57\u6bb5\u503c\u7684\u957f\u5ea6\u65e0\u5173 \u3002\u800cvarchar\u662f\u53d8\u957f\u5b57\u7b26\u4e32，\u6307\u5b9a\u7684\u957f\u5ea6\u4e3a\u6700\u5927\u5360\u7528\u957f\u5ea6 \u3002\u76f8\u5bf9\u6765\u8bf4，char\u7684\u6027\u80fd\u4f1a\u66f4\u9ad8\u4e9b\u3002<\/p>\n

                      \n

                      \"\"<\/p>\n

                      3). \u65e5\u671f\u65f6\u95f4\u7c7b\u578b<\/span><\/h4>\n\n\n\n\n\n\n\n\n
                      \n

                      \u7c7b\u578b<\/span><\/p>\n<\/td>\n

                      		\n

                      \u5927\u5c0f<\/span><\/p>\n<\/td>\n

                      		\n

                      \u8303\u56f4<\/span><\/p>\n<\/td>\n

                      		\n

                      \u683c\u5f0f<\/span><\/p>\n<\/td>\n

                      		\n

                      \u63cf\u8ff0<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      DATE<\/span><\/p>\n<\/td>\n

                      		\n

                      3<\/span><\/p>\n<\/td>\n

                      		\n

                      1000-01-01 \u81f3 9999-12-31<\/span><\/p>\n<\/td>\n

                      		\n

                      YYYY-MM-DD<\/span><\/p>\n<\/td>\n

                      		\n

                      \u65e5\u671f\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      TIME<\/span><\/p>\n<\/td>\n

                      		\n

                      3<\/span><\/p>\n<\/td>\n

                      		\n

                      -838:59:59 \u81f3 838:59:59<\/span><\/p>\n<\/td>\n

                      		\n

                      HH:MM:SS<\/span><\/p>\n<\/td>\n

                      		\n

                      \u65f6\u95f4\u503c\u6216\u6301\u7eed\u65f6\u95f4<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      YEAR<\/span><\/p>\n<\/td>\n

                      		\n

                      1<\/span><\/p>\n<\/td>\n

                      		\n

                      1901 \u81f3 2155<\/span><\/p>\n<\/td>\n

                      		\n

                      YYYY<\/span><\/p>\n<\/td>\n

                      		\n

                      \u5e74\u4efd\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      DATETIME<\/span><\/p>\n<\/td>\n

                      		\n

                      8<\/span><\/p>\n<\/td>\n

                      		\n

                      1000-01-01 00:00:00 \u81f3 9999-12-31 23:59:59<\/span><\/p>\n<\/td>\n

                      		\n

                      YYYY-MM-DD HH:MM:SS<\/span><\/p>\n<\/td>\n

                      		\n

                      \u6df7\u5408\u65e5\u671f\u548c\u65f6\u95f4\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                      \n

                      TIMESTAMP<\/span><\/p>\n<\/td>\n

                      		\n

                      4<\/span><\/p>\n<\/td>\n

                      		\n

                      1970-01-01 00:00:01 \u81f3 2038-01-19 03:14:07<\/span><\/p>\n<\/td>\n

                      		\n

                      YYYY-MM-DD HH:MM:SS<\/span><\/p>\n<\/td>\n

                      		\n

                      \u6df7\u5408\u65e5\u671f\u548c\u65f6\u95f4\u503c，\u65f6\u95f4\u6233<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                      \n

                      \"\"<\/p>\n

                      \n

                      \n

                      \n

                      DML\u8bed\u53e5<\/span><\/h3>\n

                      DML\u82f1\u6587\u5168\u79f0\u662fData Manipulation Language(\u6570\u636e\u64cd\u4f5c\u8bed\u8a00)，\u7528\u6765\u5bf9\u6570\u636e\u5e93\u4e2d\u8868\u7684\u6570\u636e\u8bb0\u5f55\u8fdb\u884c\u589e\u3001\u5220\u3001\u6539\u64cd\u4f5c\u3002<\/p>\n

                      \n

                      \u589e\u52a0(insert)<\/span><\/h4>\n

                      \u8bed\u6cd5<\/span><\/p>\n

                      \"\"<\/p>\n

                      \n

                      \"\"<\/p>\n<\/p>\n

                      \u4fee\u6539(update)<\/span><\/h4>\n

                      \u8bed\u6cd5<\/span><\/p>\n

                      \n

                      \"\"<\/p>\n

                      \n

                      \"\"<\/p>\n

                      \n

                      \u5220\u9664(delete)<\/span><\/h4>\n

                      \u8bed\u6cd5<\/span><\/p>\n

                      \n

                      \"\"<\/p>\n

                      \n

                      \"\"<\/p>\n

                      \n

                      \n

                      DQL\u8bed\u53e5(\u91cd\u8981)<\/span><\/h3>\n

                      \u4ecb\u7ecd<\/span><\/h4>\n

                      DQL\u82f1\u6587\u5168\u79f0\u662fData Query Language(\u6570\u636e\u67e5\u8be2\u8bed\u8a00)，\u7528\u6765\u67e5\u8be2\u6570\u636e\u5e93\u8868\u4e2d\u7684\u8bb0\u5f55\u3002<\/p>\n

                      \u67e5\u8be2\u5173\u952e\u5b57：SELECT<\/span><\/p>\n

                      \n

                      \u8bed\u6cd5<\/span><\/h4>\n

                      DQL\u67e5\u8be2\u8bed\u53e5，\u8bed\u6cd5\u7ed3\u6784\u5982\u4e0b：<\/p>\n

                      \n

                      \"\"<\/p>\n<\/p>\n

                      \u57fa\u672c\u67e5\u8be2<\/span><\/h4>\n

                      \u5728\u57fa\u672c\u67e5\u8be2\u7684DQL\u8bed\u53e5\u4e2d，\u4e0d\u5e26\u4efb\u4f55\u7684\u67e5\u8be2\u6761\u4ef6\u3002<\/p>\n

                      \u8bed\u6cd5\u5982\u4e0b：<\/span><\/p>\n

                        \n
                      • \u67e5\u8be2\u591a\u4e2a\u5b57\u6bb5<\/li>\n<\/ul>\n

                        \"\"<\/p>\n

                        \n

                        \"\"<\/p>\n

                        \n

                        \n

                        \u6761\u4ef6\u67e5\u8be2<\/span><\/h4>\n

                        \u8bed\u6cd5：<\/span><\/p>\n

                        \n

                        \"\"<\/p>\n

                        \u5e38\u7528\u7684\u6bd4\u8f83\u8fd0\u7b97\u7b26\u5982\u4e0b:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
                        \n

                        \u6bd4\u8f83\u8fd0\u7b97\u7b26<\/span><\/p>\n<\/td>\n

                        		\n

                        \u529f\u80fd<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        ><\/span><\/p>\n<\/td>\n

                        		\n

                        \u5927\u4e8e<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        >=<\/span><\/p>\n<\/td>\n

                        		\n

                        \u5927\u4e8e\u7b49\u4e8e<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        <<\/span><\/p>\n<\/td>\n

                        		\n

                        \u5c0f\u4e8e<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        <=<\/span><\/p>\n<\/td>\n

                        		\n

                        \u5c0f\u4e8e\u7b49\u4e8e<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        =<\/span><\/p>\n<\/td>\n

                        		\n

                        \u7b49\u4e8e<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        <> \u6216 !=<\/span><\/p>\n<\/td>\n

                        		\n

                        \u4e0d\u7b49\u4e8e<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        between … and …<\/span><\/p>\n<\/td>\n

                        		\n

                        \u5728\u67d0\u4e2a\u8303\u56f4\u4e4b\u5185(\u542b\u6700\u5c0f\u3001\u6700\u5927\u503c)<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        in(…)<\/span><\/p>\n<\/td>\n

                        		\n

                        \u5728in\u4e4b\u540e\u7684\u5217\u8868\u4e2d\u7684\u503c，\u591a\u9009\u4e00<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        like \u5360\u4f4d\u7b26<\/span><\/p>\n<\/td>\n

                        		\n

                        \u6a21\u7cca\u5339\u914d(_\u5339\u914d\u5355\u4e2a\u5b57\u7b26, %\u5339\u914d\u4efb\u610f\u4e2a\u5b57\u7b26)<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        is null<\/span><\/p>\n<\/td>\n

                        		\n

                        \u662fnull<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                        \u5e38\u7528\u7684\u903b\u8f91\u8fd0\u7b97\u7b26\u5982\u4e0b:<\/p>\n\n\n\n\n\n\n
                        \n

                        \u903b\u8f91\u8fd0\u7b97\u7b26<\/span><\/p>\n<\/td>\n

                        		\n

                        \u529f\u80fd<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        and \u6216 &&<\/span><\/p>\n<\/td>\n

                        		\n

                        \u5e76\u4e14 (\u591a\u4e2a\u6761\u4ef6\u540c\u65f6\u6210\u7acb)<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        or \u6216 ||<\/span><\/p>\n<\/td>\n

                        		\n

                        \u6216\u8005 (\u591a\u4e2a\u6761\u4ef6\u4efb\u610f\u4e00\u4e2a\u6210\u7acb)<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        not \u6216 !<\/span><\/p>\n<\/td>\n

                        		\n

                        \u975e , \u4e0d\u662f<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                        \n

                        \u6ce8\u610f：\u67e5\u8be2\u4e3aNULL\u7684\u6570\u636e\u65f6，\u4e0d\u80fd\u4f7f\u7528 = null \u6216 ！=null \u3002\u5f97\u4f7f\u7528 is null \u6216 is not null\u3002<\/span>\"\"<\/p>\n

                        \n

                        \"\"<\/p>\n

                        \n

                        \n

                        \u805a\u5408\u51fd\u6570<\/span><\/h4>\n

                        \u5e38\u7528\u805a\u5408\u51fd\u6570：<\/p>\n\n\n\n\n\n\n\n\n
                        \n

                        \u51fd\u6570<\/span><\/p>\n<\/td>\n

                        		\n

                        \u529f\u80fd<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        count<\/span><\/p>\n<\/td>\n

                        		\n

                        \u7edf\u8ba1\u6570\u91cf<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        max<\/span><\/p>\n<\/td>\n

                        		\n

                        \u6700\u5927\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        min<\/span><\/p>\n<\/td>\n

                        		\n

                        \u6700\u5c0f\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        avg<\/span><\/p>\n<\/td>\n

                        		\n

                        \u5e73\u5747\u503c<\/span><\/p>\n<\/td>\n<\/tr>\n

                        \n

                        sum<\/span><\/p>\n<\/td>\n

                        		\n

                        \u6c42\u548c<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                        \n

                          \n
                        • count ：\u6309\u7167\u5217\u53bb\u7edf\u8ba1\u6709\u591a\u5c11\u884c\u6570\u636e\u3002\n
                            \n
                          • \u5728\u6839\u636e\u6307\u5b9a\u7684\u5217\u7edf\u8ba1\u7684\u65f6\u5019，\u5982\u679c\u8fd9\u4e00\u5217\u4e2d\u6709null\u7684\u884c，\u8be5\u884c\u4e0d\u4f1a\u88ab\u7edf\u8ba1\u5728\u5176\u4e2d\u3002<\/li>\n<\/ul>\n<\/li>\n
                          • sum ：\u8ba1\u7b97\u6307\u5b9a\u5217\u7684\u6570\u503c\u548c，\u5982\u679c\u4e0d\u662f\u6570\u503c\u7c7b\u578b，\u90a3\u4e48\u8ba1\u7b97\u7ed3\u679c\u4e3a0<\/li>\n
                          • max ：\u8ba1\u7b97\u6307\u5b9a\u5217\u7684\u6700\u5927\u503c<\/li>\n
                          • min ：\u8ba1\u7b97\u6307\u5b9a\u5217\u7684\u6700\u5c0f\u503c<\/li>\n
                          • avg ：\u8ba1\u7b97\u6307\u5b9a\u5217\u7684\u5e73\u5747\u503c<\/li>\n<\/ul>\n

                            \"\"<\/p>\n

                            \n

                            \"\"<\/p>\n

                            \n<\/p>\n

                            \u5206\u7ec4\u67e5\u8be2<\/span><\/h4>\n

                            \u8bed\u6cd5：<\/span><\/p>\n

                            select\u00a0 \u5b57\u6bb5\u5217\u8868\u00a0 from\u00a0 \u8868\u540d\u00a0 [where \u6761\u4ef6]\u00a0 group by \u5206\u7ec4\u5b57\u6bb5\u540d\u00a0 [having \u5206\u7ec4\u540e\u8fc7\u6ee4\u6761\u4ef6];<\/p>\n

                            \n

                              \n
                            • \u6848\u4f8b1：\u6839\u636e\u6027\u522b\u5206\u7ec4 , \u7edf\u8ba1\u7537\u6027\u548c\u5973\u6027\u5458\u5de5\u7684\u6570\u91cf<\/li>\n<\/ul>\n

                              \"\"<\/p>\n

                              \n

                              \"\"<\/p>\n

                              \u6267\u884c\u987a\u5e8f：where > \u805a\u5408\u51fd\u6570 > having<\/p>\n

                              \n

                              \n

                              where\u4e0ehaving\u533a\u522b（\u9762\u8bd5\u9898）<\/span><\/p>\n

                                \n
                              • \u6267\u884c\u65f6\u673a\u4e0d\u540c：where\u662f\u5206\u7ec4\u4e4b\u524d\u8fdb\u884c\u8fc7\u6ee4，\u4e0d\u6ee1\u8db3where\u6761\u4ef6，\u4e0d\u53c2\u4e0e\u5206\u7ec4；\u800chaving\u662f\u5206\u7ec4\u4e4b\u540e\u5bf9\u7ed3\u679c\u8fdb\u884c\u8fc7\u6ee4\u3002<\/li>\n
                              • \u5224\u65ad\u6761\u4ef6\u4e0d\u540c：where\u4e0d\u80fd\u5bf9\u805a\u5408\u51fd\u6570\u8fdb\u884c\u5224\u65ad，\u800chaving\u53ef\u4ee5\u3002<\/li>\n<\/ul>\n

                                \n

                                \u6392\u67e5\u67e5\u8be2<\/span><\/h4>\n

                                \u6392\u5e8f\u5728\u65e5\u5e38\u5f00\u53d1\u4e2d\u662f\u975e\u5e38\u5e38\u89c1\u7684\u4e00\u4e2a\u64cd\u4f5c，\u6709\u5347\u5e8f\u6392\u5e8f，\u4e5f\u6709\u964d\u5e8f\u6392\u5e8f\u3002<\/p>\n

                                \u8bed\u6cd5：<\/p>\n

                                \"\"<\/p>\n

                                \n

                                \"\"<\/p>\n

                                \n

                                \"\"<\/p>\n

                                \n

                                \"\"<\/p>\n

                                \n

                                \u5206\u9875\u67e5\u8be2<\/span><\/h4>\n

                                \u5206\u9875\u67e5\u8be2\u8bed\u6cd5：<\/p>\n

                                \n

                                select\u00a0 \u5b57\u6bb5\u5217\u8868\u00a0 from\u00a0 \u8868\u540d\u00a0 limit\u00a0 \u8d77\u59cb\u7d22\u5f15, \u67e5\u8be2\u8bb0\u5f55\u6570 ;<\/p>\n

                                \"\"<\/p>\n

                                \u5982\u679c\u67e5\u8be2\u7684\u662f\u7b2c1\u9875\u6570\u636e，\u8d77\u59cb\u7d22\u5f15\u53ef\u4ee5\u7701\u7565，\u76f4\u63a5\u7b80\u5199\u4e3a：limit \u6761\u6570<\/p>\n

                                \n

                                \"\"<\/p>\n

                                \n

                                \u6b22\u8fce 👍\u70b9\u8d5e\u270d\u8bc4\u8bba\u2b50\u6536\u85cf，\u6b22\u8fce\u6307\u6b63<\/p>\n","protected":false},"excerpt":{"rendered":"

                                SQL\u8bed\u53e5SQL：\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\u3002\u4e00\u95e8\u64cd\u4f5c\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u7f16\u7a0b\u8bed\u8a00，\u5b9a\u4e49\u64cd\u4f5c\u6240\u6709\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u7edf\u4e00\u6807\u51c6\u3002SQL\u8bed\u53e5\u6839\u636e\u5176\u529f\u80fd\u88ab\u5206\u4e3a\u56db\u5927\u7c7b：DDL\u3001DML\u3001DQL\u3001DCL \u3002\u5206\u7c7b\u5168\u79f0\u8bf4\u660eDDLData Definition Language\u6570\u636e\u5b9a\u4e49\u8bed\u8a00，\u7528\u6765\u5b9a\u4e49\u6570\u636e\u5e93\u5bf9\u8c61(\u6570\u636e\u5e93，\u8868，\u5b57\u6bb5)DMLData Manipulation Language\u6570\u636e\u64cd\u4f5c\u8bed\u8a00，\u7528\u6765\u5bf9\u6570\u636e\u5e93\u8868\u4e2d\u7684\u6570\u636e<\/p>\n","protected":false},"author":2,"featured_media":70392,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,1769,114,768,100],"topic":[],"class_list":["post-70412","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-mybatis","tag-mysql","tag-sql","tag-100"],"yoast_head":"\n\u3010MYSQL\u57fa\u7840\u8bed\u6cd5\u603b\u7ed3\u3011 - 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