{"id":5419,"date":"2024-11-14T09:02:50","date_gmt":"2024-11-14T01:02:50","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5419\/"},"modified":"2024-11-14T09:02:50","modified_gmt":"2024-11-14T01:02:50","slug":"mysql%e5%87%bd%e6%95%b0%e6%80%8e%e4%b9%88%e7%94%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5419\/","title":{"rendered":"mysql\u51fd\u6570\u600e\u4e48\u7528"},"content":{"rendered":"

\n \u5982\u4f55\u5728mysql\u4e2d\u4f7f\u7528\u51fd\u6570\uff1f\u5728sql\u67e5\u8be2\u4e2d\u8c03\u7528\u6240\u9700\u51fd\u6570\uff0c\u8bed\u6cd5\uff1afunction_name(argument1, argument2, …)\u3002\u5e38\u89c1\u7684\u51fd\u6570\u5206\u7c7b\u4e3a\uff1a\u5b57\u7b26\u4e32\u51fd\u6570\uff08\u5982 concat()\u3001length()\uff09\u3001\u6570\u503c\u51fd\u6570\uff08\u5982 abs()\u3001round()\uff09\u3001\u65e5\u671f\u548c\u65f6\u95f4\u51fd\u6570\uff08\u5982 now()\u3001date()\uff09\u3001\u805a\u5408\u51fd\u6570\uff08\u5982 sum()\u3001count()\uff09\u3001\u4ee5\u53ca\u5176\u4ed6\u51fd\u6570\uff08\u5982 if()\u3001rand()\u3001uuid()\uff09\u3002\n<\/p><\/blockquote>\n

\"mysql\u51fd\u6570\u600e\u4e48\u7528\u63d2\u56fe\"<\/p>\n

MySQL \u51fd\u6570\u6307\u5357<\/strong><\/p>\n

MySQL \u51fd\u6570\u662f\u4e00\u79cd\u9884\u5b9a\u4e49\u7684\u4ee3\u7801\u5757\uff0c\u7528\u4e8e\u6267\u884c\u7279\u5b9a\u4efb\u52a1\u3002\u5b83\u4eec\u5728\u5904\u7406\u6570\u636e\u3001\u8fdb\u884c\u8ba1\u7b97\u548c\u65b9\u9762\u63d0\u4f9b\u5f3a\u5927\u7684\u529f\u80fd\u3002<\/p>\n

\u5982\u4f55\u4f7f\u7528 MySQL \u51fd\u6570\uff1f<\/strong><\/p>\n

\u8981\u4f7f\u7528 MySQL \u51fd\u6570\uff0c\u53ea\u9700\u5728 SQL \u67e5\u8be2\u4e2d\u8c03\u7528\u5b83\u4eec\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

FUNCTION_NAME(argument1, argument2, ...)<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5e38\u7528 MySQL \u51fd\u6570<\/strong><\/p>\n
\u4ee5\u4e0b\u662f MySQL \u4e2d\u4e00\u4e9b\u5e38\u7528\u7684\u51fd\u6570\uff0c\u6839\u636e\u5176\u7c7b\u522b\u8fdb\u884c\u5206\u7c7b\uff1a<\/p>\n
\u5b57\u7b26\u4e32\u51fd\u6570<\/strong><\/p>\n
    \n
  •  CONCAT()<\/strong>\uff1a\u8fde\u63a5\u5b57\u7b26\u4e32\u3002<\/li>\n
  •  LENGTH()<\/strong>\uff1a\u83b7\u53d6\u5b57\u7b26\u4e32\u957f\u5ea6\u3002<\/li>\n
  •  UPPER()<\/strong>\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u3002<\/li>\n
  •  LOWER()<\/strong>\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u3002<\/li>\n
  •  SUBSTRING()<\/strong>\uff1a\u4ece\u5b57\u7b26\u4e32\u4e2d\u63d0\u53d6\u5b50\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n
    \u6570\u503c\u51fd\u6570<\/strong><\/p>\n
      \n
    •  ABS()<\/strong>\uff1a\u8fd4\u56de\u7edd\u5bf9\u503c\u3002<\/li>\n
    •  ROUND()<\/strong>\uff1a\u56db\u820d\u4e94\u5165\u6570\u5b57\u3002<\/li>\n
    •  CEILING()<\/strong>\uff1a\u5411\u4e0a\u820d\u5165\u5230\u6700\u8fd1\u7684\u6574\u6570\u3002<\/li>\n
    •  FLOOR()<\/strong>\uff1a\u5411\u4e0b\u820d\u5165\u5230\u6700\u8fd1\u7684\u6574\u6570\u3002<\/li>\n
    •  MOD()<\/strong>\uff1a\u8fd4\u56de\u9664\u6cd5\u4f59\u6570\u3002<\/li>\n<\/ul>\n
      \u65e5\u671f\u548c\u65f6\u95f4\u51fd\u6570<\/strong><\/p>\n
        \n
      •  NOW()<\/strong>\uff1a\u83b7\u53d6\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\u3002<\/li>\n
      •  DATE()<\/strong>\uff1a\u4ec5\u83b7\u53d6\u65e5\u671f\u90e8\u5206\u3002<\/li>\n
      •  TIME()<\/strong>\uff1a\u4ec5\u83b7\u53d6\u65f6\u95f4\u90e8\u5206\u3002<\/li>\n
      •  ADD()<\/strong>\uff1a\u5411\u65e5\u671f\u6216\u65f6\u95f4\u6dfb\u52a0\u65f6\u95f4\u95f4\u9694\u3002<\/li>\n
      •  SUB()<\/strong>\uff1a\u4ece\u65e5\u671f\u6216\u65f6\u95f4\u51cf\u53bb\u65f6\u95f4\u95f4\u9694\u3002<\/li>\n<\/ul>\n
        <\/strong><\/p>\n
          \n
        •  SUM()<\/strong>\uff1a\u8ba1\u7b97\u6570\u503c\u5b57\u6bb5\u7684\u603b\u548c\u3002<\/li>\n
        •  COUNT()<\/strong>\uff1a\u8ba1\u7b97\u8bb0\u5f55\u6570\u3002<\/li>\n
        •  MIN()<\/strong>\uff1a\u8fd4\u56de\u4e00\u7ec4\u503c\u4e2d\u7684\u6700\u5c0f\u503c\u3002<\/li>\n
        •  MAX()<\/strong>\uff1a\u8fd4\u56de\u4e00\u7ec4\u503c\u4e2d\u7684\u6700\u5927\u503c\u3002<\/li>\n
        •  AVG()<\/strong>\uff1a\u8fd4\u56de\u4e00\u7ec4\u503c\u7684\u5e73\u5747\u503c\u3002<\/li>\n<\/ul>\n
          \u5176\u4ed6\u51fd\u6570<\/strong><\/p>\n
            \n
          •  IF()<\/strong>\uff1a\u6839\u636e\u6761\u4ef6\u8fd4\u56de\u4e00\u4e2a\u503c\u3002<\/li>\n
          •  CASE<\/strong>\uff1a\u6839\u636e\u591a\u4e2a\u6761\u4ef6\u8fd4\u56de\u4e0d\u540c\u7684\u503c\u3002<\/li>\n
          •  RAND()<\/strong>\uff1a\u751f\u6210\u968f\u673a\u6570\u5b57\u3002<\/li>\n
          •  UUID()<\/strong>\uff1a\u751f\u6210\u552f\u4e00\u6807\u8bc6\u7b26 (UUID)\u3002<\/li>\n
          •  MD5()<\/strong>\uff1a\u8ba1\u7b97\u5b57\u7b26\u4e32\u7684 MD5 \u54c8\u5e0c\u503c\u3002<\/li>\n<\/ul>\n
            \u4ee5\u4e0a\u5c31\u662f\u51fd\u6570\u600e\u4e48\u7528\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
            \u5982\u4f55\u5728mysql\u4e2d\u4f7f\u7528\u51fd\u6570\uff1f\u5728sql\u67e5\u8be2\u4e2d\u8c03\u7528\u6240\u9700\u51fd\u6570\uff0c\u8bed\u6cd5\uff1afunction_name(argument1, argument2, …)\u3002\u5e38\u89c1\u7684\u51fd\u6570\u5206\u7c7b\u4e3a\uff1a\u5b57\u7b26\u4e32\u51fd\u6570\uff08\u5982 concat()\u3001length()\uff09\u3001\u6570\u503c\u51fd\u6570\uff08\u5982 abs()\u3001round()\uff09\u3001\u65e5\u671f\u548c\u65f6\u95f4\u51fd\u6570\uff08\u5982 now()\u3001date()\uff09\u3001\u805a\u5408\u51fd\u6570\uff08\u5982 sum()\u3001count()\uff09\u3001\u4ee5\u53ca\u5176\u4ed6\u51fd\u6570\uff08\u5982 if()\u3001rand()\u3001uuid()\uff09\u3002 MySQL \u51fd\u6570\u6307\u5357 MySQL \u51fd\u6570\u662f\u4e00\u79cd\u9884\u5b9a\u4e49\u7684\u4ee3\u7801\u5757\uff0c\u7528\u4e8e\u6267\u884c\u7279\u5b9a\u4efb\u52a1\u3002\u5b83\u4eec\u5728\u5904\u7406\u6570\u636e\u3001\u8fdb\u884c\u8ba1\u7b97\u548c\u65b9\u9762\u63d0\u4f9b\u5f3a\u5927\u7684\u529f\u80fd\u3002 \u5982\u4f55\u4f7f\u7528 MySQL \u51fd\u6570\uff1f \u8981\u4f7f\u7528 MySQL \u51fd\u6570\uff0c\u53ea\u9700\u5728 SQL \u67e5\u8be2\u4e2d\u8c03\u7528\u5b83\u4eec\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a FUNCTION_NAME(argument1, argument2, …) \u767b\u5f55\u540e\u590d\u5236 \u5e38\u7528 MySQL \u51fd\u6570 \u4ee5\u4e0b\u662f MySQL \u4e2d\u4e00\u4e9b\u5e38\u7528\u7684\u51fd\u6570\uff0c\u6839\u636e\u5176\u7c7b\u522b\u8fdb\u884c\u5206\u7c7b\uff1a \u5b57\u7b26\u4e32\u51fd\u6570 CONCAT()\uff1a\u8fde\u63a5\u5b57\u7b26\u4e32\u3002 LENGTH()\uff1a\u83b7\u53d6\u5b57\u7b26\u4e32\u957f\u5ea6\u3002 UPPER()\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u3002 LOWER()\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u3002 SUBSTRING()\uff1a\u4ece\u5b57\u7b26\u4e32\u4e2d\u63d0\u53d6\u5b50\u5b57\u7b26\u4e32\u3002 \u6570\u503c\u51fd\u6570 ABS()\uff1a\u8fd4\u56de\u7edd\u5bf9\u503c\u3002 ROUND()\uff1a\u56db\u820d\u4e94\u5165\u6570\u5b57\u3002 CEILING()\uff1a\u5411\u4e0a\u820d\u5165\u5230\u6700\u8fd1\u7684\u6574\u6570\u3002 FLOOR()\uff1a\u5411\u4e0b\u820d\u5165\u5230\u6700\u8fd1\u7684\u6574\u6570\u3002 MOD()\uff1a\u8fd4\u56de\u9664\u6cd5\u4f59\u6570\u3002 \u65e5\u671f\u548c\u65f6\u95f4\u51fd\u6570 NOW()\uff1a\u83b7\u53d6\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\u3002 DATE()\uff1a\u4ec5\u83b7\u53d6\u65e5\u671f\u90e8\u5206\u3002 TIME()\uff1a\u4ec5\u83b7\u53d6\u65f6\u95f4\u90e8\u5206\u3002 ADD()\uff1a\u5411\u65e5\u671f\u6216\u65f6\u95f4\u6dfb\u52a0\u65f6\u95f4\u95f4\u9694\u3002 SUB()\uff1a\u4ece\u65e5\u671f\u6216\u65f6\u95f4\u51cf\u53bb\u65f6\u95f4\u95f4\u9694\u3002 SUM()\uff1a\u8ba1\u7b97\u6570\u503c\u5b57\u6bb5\u7684\u603b\u548c\u3002 COUNT()\uff1a\u8ba1\u7b97\u8bb0\u5f55\u6570\u3002 MIN()\uff1a\u8fd4\u56de\u4e00\u7ec4\u503c\u4e2d\u7684\u6700\u5c0f\u503c\u3002 MAX()\uff1a\u8fd4\u56de\u4e00\u7ec4\u503c\u4e2d\u7684\u6700\u5927\u503c\u3002 AVG()\uff1a\u8fd4\u56de\u4e00\u7ec4\u503c\u7684\u5e73\u5747\u503c\u3002 \u5176\u4ed6\u51fd\u6570 IF()\uff1a\u6839\u636e\u6761\u4ef6\u8fd4\u56de\u4e00\u4e2a\u503c\u3002 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5419","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5419","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5419"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5419\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5419"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5419"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5419"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}