{"id":6360,"date":"2024-11-14T10:09:46","date_gmt":"2024-11-14T02:09:46","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6360\/"},"modified":"2024-11-14T10:09:46","modified_gmt":"2024-11-14T02:09:46","slug":"mysql%e6%9f%a5%e8%af%a2%e4%b8%89%e4%b8%aa%e8%a1%a8%e7%9a%84%e8%af%ad%e6%b3%95","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6360\/","title":{"rendered":"mysql\u67e5\u8be2\u4e09\u4e2a\u8868\u7684\u8bed\u6cd5"},"content":{"rendered":"

\n \u4f7f\u7528 join \u8bed\u53e5\u5728 mysql \u4e2d\u67e5\u8be2\u4e09\u4e2a\u8868\u7684\u8bed\u6cd5\u4e3a\uff1aselect from join on . = .join on . = .\n<\/p><\/blockquote>\n

\"mysql\u67e5\u8be2\u4e09\u4e2a\u8868\u7684\u8bed\u6cd5\u63d2\u56fe\"<\/p>\n

MySQL \u67e5\u8be2\u4e09\u4e2a\u8868\u7684\u8bed\u6cd5<\/strong><\/p>\n

\u5728 MySQL \u4e2d\uff0c\u4f7f\u7528 JOIN \u8bed\u53e5\u67e5\u8be2\u4e09\u4e2a\u8868\u65f6\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

SELECT <\u5217\u540d>\nFROM <\u88681>\nJOIN <\u88682> ON <\u88681>.<\u5173\u8054\u5b57\u6bb5> = <\u88682>.<\u5173\u8054\u5b57\u6bb5>\nJOIN <\u88683> ON <\u88682>.<\u5173\u8054\u5b57\u6bb5> = <\u88683>.<\u5173\u8054\u5b57\u6bb5>;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u8bf4\u660e\uff1a<\/strong><\/p>\n
    \n
  •  \uff1a<\/strong>\u8981\u67e5\u8be2\u7684\u5217\uff0c\u53ef\u4ee5\u6765\u81ea\u4efb\u4f55\u4e09\u4e2a\u8868\u3002<\/li>\n
  •  \u3001\u3001\uff1a<\/strong>\u8981\u67e5\u8be2\u7684\u4e09\u4e2a\u8868\u3002<\/li>\n
  •  \uff1a<\/strong>\u7528\u4e8e\u8fde\u63a5\u8868\u7684\u5b57\u6bb5\u3002\u8fd9\u4e9b\u5b57\u6bb5\u5fc5\u987b\u5728\u6240\u6709\u8fde\u63a5\u7684\u8868\u4e2d\u5177\u6709\u5339\u914d\u7684\u6570\u636e\u7c7b\u578b\u548c\u957f\u5ea6\u3002<\/li>\n
  • \n
    JOIN\uff1a<\/strong>\u6307\u5b9a\u8868\u4e4b\u95f4\u7684\u8fde\u63a5\u7c7b\u578b\u3002\u5e38\u89c1\u7c7b\u578b\u5305\u62ec\uff1a<\/p>\n
      \n
    •  INNER JOIN\uff1a<\/strong>\u4ec5\u8fd4\u56de\u540c\u65f6\u5b58\u5728\u4e8e\u6240\u6709\u8868\u4e2d\u7684\u884c\u3002<\/li>\n
    • **LEFT JOIN\uff1a \u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5728\u5176\u4ed6\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u884c\u3002<\/li>\n
    • **RIGHT JOIN\uff1a \u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5728\u5176\u4ed6\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u884c\u3002<\/li>\n
    • **FULL JOIN\uff1a \u548c \u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5728\u4efb\u4f55\u5176\u4ed6\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
      \u793a\u4f8b\uff1a<\/strong><\/p>\n
      \u5047\u8bbe\u6211\u4eec\u6709\u4ee5\u4e0b\u4e09\u4e2a\u8868\uff1a<\/p>\n
        \n
      • \u5ba2\u6237\u8868 (Customers) – \u5305\u542b\u5ba2\u6237 ID\u3001\u59d3\u540d\u548c\u57ce\u5e02<\/li>\n
      • \u8ba2\u5355\u8868 (Orders) – \u5305\u542b\u8ba2\u5355 ID\u3001\u5ba2\u6237 ID \u548c\u8ba2\u5355\u65e5\u671f<\/li>\n
      • \u4ea7\u54c1\u8868 (Products) – \u5305\u542b\u4ea7\u54c1 ID\u3001\u4ea7\u54c1\u540d\u79f0\u548c\u4ef7\u683c<\/li>\n<\/ul>\n
        \u8981\u67e5\u8be2\u6bcf\u4e2a\u5ba2\u6237\u53ca\u5176\u6700\u8fd1\u8ba2\u5355\u7684\u8be6\u60c5\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8be2\uff1a<\/p>\n
        SELECT c.CustomerName, o.OrderDate, p.ProductName\nFROM Customers c\nJOIN Orders o ON c.CustomerID = o.CustomerID\nJOIN Products p ON o.ProductID = p.ProductID\nORDER BY o.OrderDate DESC;<\/pre>\n
         \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
        \u4ee5\u4e0a\u5c31\u662f\u67e5\u8be2\u4e09\u4e2a\u8868\u7684\u8bed\u6cd5\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":"
        \u4f7f\u7528 join \u8bed\u53e5\u5728 mysql \u4e2d\u67e5\u8be2\u4e09\u4e2a\u8868\u7684\u8bed\u6cd5\u4e3a\uff1aselect from join on . = .join on . = . MySQL \u67e5\u8be2\u4e09\u4e2a\u8868\u7684\u8bed\u6cd5 \u5728 MySQL \u4e2d\uff0c\u4f7f\u7528 JOIN \u8bed\u53e5\u67e5\u8be2\u4e09\u4e2a\u8868\u65f6\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a SELECT <\u5217\u540d> FROM <\u88681> JOIN <\u88682> ON <\u88681>.<\u5173\u8054\u5b57\u6bb5> = <\u88682>.<\u5173\u8054\u5b57\u6bb5> JOIN <\u88683> ON <\u88682>.<\u5173\u8054\u5b57\u6bb5> = <\u88683>.<\u5173\u8054\u5b57\u6bb5>; \u767b\u5f55\u540e\u590d\u5236 \u8bf4\u660e\uff1a \uff1a\u8981\u67e5\u8be2\u7684\u5217\uff0c\u53ef\u4ee5\u6765\u81ea\u4efb\u4f55\u4e09\u4e2a\u8868\u3002 \u3001\u3001\uff1a\u8981\u67e5\u8be2\u7684\u4e09\u4e2a\u8868\u3002 \uff1a\u7528\u4e8e\u8fde\u63a5\u8868\u7684\u5b57\u6bb5\u3002\u8fd9\u4e9b\u5b57\u6bb5\u5fc5\u987b\u5728\u6240\u6709\u8fde\u63a5\u7684\u8868\u4e2d\u5177\u6709\u5339\u914d\u7684\u6570\u636e\u7c7b\u578b\u548c\u957f\u5ea6\u3002 JOIN\uff1a\u6307\u5b9a\u8868\u4e4b\u95f4\u7684\u8fde\u63a5\u7c7b\u578b\u3002\u5e38\u89c1\u7c7b\u578b\u5305\u62ec\uff1a INNER JOIN\uff1a\u4ec5\u8fd4\u56de\u540c\u65f6\u5b58\u5728\u4e8e\u6240\u6709\u8868\u4e2d\u7684\u884c\u3002 **LEFT JOIN\uff1a \u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5728\u5176\u4ed6\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u884c\u3002 **RIGHT JOIN\uff1a \u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5728\u5176\u4ed6\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u884c\u3002 **FULL JOIN\uff1a \u548c […]<\/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-6360","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6360","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=6360"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6360\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6360"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6360"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6360"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}