{"id":582,"date":"2024-12-08T19:36:07","date_gmt":"2024-12-08T11:36:07","guid":{"rendered":"http:\/\/www.cmd137blog.top\/?p=582"},"modified":"2024-12-08T19:36:13","modified_gmt":"2024-12-08T11:36:13","slug":"sql-dml%e3%80%81dql","status":"publish","type":"post","link":"http:\/\/www.cmd137blog.top\/?p=582","title":{"rendered":"SQL-DML\u3001DQL"},"content":{"rendered":"\n

1 DML \u589e\u5220\u6539<\/h1>\n\n\n\n

1.1 INSERT<\/h2>\n\n\n\n
    \n
  1. \u6307\u5b9a\u5b57\u6bb5\u6dfb\u52a0\u6570\u636e\uff1aINSERT INTO \u8868\u540d (\u5b57\u6bb5\u540d1, \u5b57\u6bb5\u540d2) VALUES (\u503c1, \u503c2);<\/code><\/li>\n\n\n\n
  2. \u5168\u90e8\u5b57\u6bb5\u6dfb\u52a0\u6570\u636e\uff1aINSERT INTO \u8868\u540d VALUES (\u503c1, \u503c2, ...);<\/code><\/li>\n\n\n\n
  3. \u6279\u91cf\u6dfb\u52a0\u6570\u636e\uff08\u6307\u5b9a\u5b57\u6bb5\uff09\uff1aINSERT INTO \u8868\u540d (\u5b57\u6bb5\u540d1, \u5b57\u6bb5\u540d2) VALUES (\u503c1, \u503c2), (\u503c1, \u503c2);<\/code><\/li>\n\n\n\n
  4. \u6279\u91cf\u6dfb\u52a0\u6570\u636e\uff08\u5168\u90e8\u5b57\u6bb5\uff09\uff1aINSERT INTO \u8868\u540d VALUES (\u503c1, \u503c2, ...), (\u503c1, \u503c2, ...);<\/code><\/li>\n<\/ol>\n\n\n\n

    1.2 UPDATE<\/h2>\n\n\n\n

    UPDATE table_name
    SET column1 = value1, column2 = value2, \u2026
    WHERE condition;<\/p>\n\n\n\n

    1.3 DETELE<\/h2>\n\n\n\n

    DELETE FROM table_name
    WHERE condition;<\/p>\n\n\n\n

    \u5f53\u6ca1\u6709where\u6761\u4ef6\u65f6\uff0c\u5373\u4e3a\u5220\u9664\u6240\u6709\u8bb0\u5f55<\/p>\n\n\n\n

    2.DQL \u5355\u8868<\/h1>\n\n\n\n
    \"\"<\/div><\/figure>\n\n\n\n

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

    SELECT column1, column2, \u2026
    FROM table_name;<\/p>\n\n\n\n

    SELECT DISTINCT \u8bed\u53e5\u7528\u4e8e\u8fd4\u56de\u552f\u4e00\u4e0d\u540c\u7684\u503c\u3002<\/p>\n\n\n\n

    SELECT DISTINCT column1, column2, \u2026
    FROM table_name;<\/p>\n\n\n\n

    \u6761\u4ef6\u67e5\u8be2 WHERE<\/h2>\n\n\n\n
    SELECT column1, column2, ...\nFROM table_name\nWHERE condition;<\/code><\/pre>\n\n\n\n
    \u53c2\u6570\u8bf4\u660e\uff1a<\/p>\n\n\n\n
      \n
    • column1, column2, …<\/strong>\uff1a\u8981\u9009\u62e9\u7684\u5b57\u6bb5\u540d\u79f0\uff0c\u53ef\u4ee5\u4e3a\u591a\u4e2a\u5b57\u6bb5\u3002\u5982\u679c\u4e0d\u6307\u5b9a\u5b57\u6bb5\u540d\u79f0\uff0c\u5219\u4f1a\u9009\u62e9\u6240\u6709\u5b57\u6bb5\u3002<\/li>\n\n\n\n
    • table_name<\/strong>\uff1a\u8981\u67e5\u8be2\u7684\u8868\u540d\u79f0\u3002<\/li>\n<\/ul>\n\n\n\n
      \u9664\u4e86\u5e38\u7528\u8fd0\u7b97\u7b26\u5916\u8fd8\u6709\uff1a<\/p>\n\n\n\n
        \n
      • BETWEEN minval  AND maxval  \u5728\u67d0\u4e2a\u8303\u56f4\u4e4b\u5185\uff08\u5305\u542b\u6700\u5c0f\u6700\u5927\u503c\uff09<\/li>\n\n\n\n
      • in\uff08v1\uff0cv2\uff0c…\uff09\u7b26\u5408\u5217\u8868\u5185\u7684\u503c<\/li>\n\n\n\n
      • LIKE \u5360\u4f4d\u7b26  \u6a21\u7cca\u5339\u914d\uff08_\u5339\u914d\u5355\u4e2a\u5b57\u7b26\uff0c%\u5339\u914d\u591a\u4e2a\u5b57\u7b26\uff09<\/li>\n\n\n\n
      • is \uff08not\uff09null  \u6ce8\u610fnull\u4e0d\u7528=<\/li>\n<\/ul>\n\n\n\n
        \u805a\u5408\u51fd\u6570\uff1a<\/h2>\n\n\n\n
        \u914d\u5408\u5206\u7ec4\u67e5\u8be2\u4f7f\u7528<\/p>\n\n\n\n
        \u51fd\u6570<\/th>\u529f\u80fd<\/th><\/tr><\/thead>
        count<\/td>\u7edf\u8ba1\u6570\u91cf<\/td><\/tr>
        max<\/td>\u6700\u5927\u503c<\/td><\/tr>
        min<\/td>\u6700\u5c0f\u503c<\/td><\/tr>
        avg<\/td>\u5e73\u5747\u503c<\/td><\/tr>
        sum<\/td>\u6c42\u548c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
          \n
        • null\u4e0d\u53c2\u4e0e\u6240\u6709\u805a\u5408\u51fd\u6570\u8fd0\u7b97<\/li>\n<\/ul>\n\n\n\n
          \u5206\u7ec4\u67e5\u8be2 group by <\/h2>\n\n\n\n
          SELECT column_name, aggregate_function(column_name)\nFROM table_name\nWHERE column_name operator value\nGROUP BY column_name;<\/code><\/pre>\n\n\n\n
            \n
          • where \u4e0e having\uff1a\n
              \n
            • \u6267\u884c\u65f6\u673a\u4e0d\u540c\uff0cwhere\u662f\u5206\u7ec4\u4e4b\u524d\u8fdb\u884c\u8fc7\u6ee4\uff0c\u4e0d\u6ee1\u8db3where\u6761\u4ef6\uff0c\u4e0d\u53c2\u4e0e\u5206\u7ec4\uff1b\u800chaving\u662f\u5206\u7ec4\u4e4b\u540e\u5bf9\u7ed3\u679c\u8fdb\u884c\u8fc7\u6ee4\u3002<\/li>\n\n\n\n
            • \u5224\u65ad\u6761\u4ef6\u4e0d\u540c\uff1awhere\u4e0d\u80fd\u5bf9\u805a\u5408\u51fd\u6570\u8fdb\u884c\u5224\u65ad\uff0c\u800chaving\u53ef\u4ee5\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
            • \u5206\u7ec4\u4e4b\u540e\uff0c\u67e5\u8be2\u5230\u5b57\u6bb5\u4e00\u822c\u4e3a\u805a\u5408\u51fd\u6570\u548c\u5206\u7ec4\u5b57\u6bb5\uff0c\u67e5\u8be2\u5176\u4ed6\u5b57\u6bb5\u6ca1\u6709\u610f\u4e49\u3002<\/li>\n\n\n\n
            • \u6267\u884c\u987a\u5e8f\uff1awhere >\u805a\u5408\u51fd\u6570 > having<\/li>\n<\/ul>\n\n\n\n
              \u6392\u5e8f\u67e5\u8be2 ORDER BY<\/h2>\n\n\n\n
               SELECT \u5b57\u6bb5\u5217\u8868\n FROM \u8868\u540d\n [WHERE \u6761\u4ef6\u5217\u8868]\n [GROUP BY \u5206\u7ec4\u5b57\u6bb5]\n ORDER BY \u5b57\u6bb51 \u6392\u5e8f\u65b9\u5f0f1\uff0c\u5b57\u6bb52 \u6392\u5e8f\u65b9\u5f0f2...;<\/code><\/pre>\n\n\n\n
              \u6392\u5e8f\u65b9\u5f0f\uff082\u79cd\uff09\uff1aASC  \u5347\u5e8f( \u9ed8\u8ba4)   \/   DESC  \u964d\u5e8f<\/p>\n\n\n\n
              \u5206\u9875\u67e5\u8be2 LIMIT<\/h2>\n\n\n\n
              select \u5b57\u6bb5\u5217\u8868 from \u8868\u540d limit \u8d77\u59cb\u7d22\u5f15\uff0c\u6bcf\u9875\u8bb0\u5f55\u6570;<\/code><\/pre>\n\n\n\n
                \n
              • \u8d77\u59cb\u7d22\u5f15\u9ed8\u8ba4\u4ece0\u5f00\u59cb\uff0c\u8d77\u59cb\u7d22\u5f15=\uff08\u67e5\u8be2\u9875\u7801-1\uff09*\u6bcf\u9875\u8bb0\u5f55\u6570\u3002<\/li>\n\n\n\n
              • LIMIT\u662fMYSQL\u7684\uff0c\u4e0d\u662fSQL\u7684\u3002<\/li>\n\n\n\n
              • \u67e5\u8be2\u7b2c\u4e00\u9875\u8d77\u59cb\u7d22\u5f15\u53ef\u4ee5\u7701\u7565\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
                1 DML \u589e\u5220\u6539 1.1 INSERT 1.2 UPDATE UPDATE table_nameSET co […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[14],"class_list":["post-582","post","type-post","status-publish","format-standard","hentry","category-sql","tag-sql"],"_links":{"self":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/582","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=582"}],"version-history":[{"count":2,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/582\/revisions"}],"predecessor-version":[{"id":585,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/582\/revisions\/585"}],"wp:attachment":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=582"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=582"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=582"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}