{"id":5181,"date":"2024-11-14T10:57:18","date_gmt":"2024-11-14T02:57:18","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5181\/"},"modified":"2024-11-14T10:57:18","modified_gmt":"2024-11-14T02:57:18","slug":"sql%e4%b8%adwith%e7%9a%84%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5181\/","title":{"rendered":"sql\u4e2dwith\u7684\u7528\u6cd5"},"content":{"rendered":"

\n with \u5b50\u53e5\u53ef\u521b\u5efa\u4e34\u65f6\u8868\uff0c\u7528\u4e8e\u5728\u67e5\u8be2\u4e2d\u5b9a\u4e49\u590d\u6742\u67e5\u8be2\uff0c\u4ece\u800c\u63d0\u5347\u4ee3\u7801\u53ef\u91cd\u7528\u6027\u3001\u6027\u80fd\u548c\u53ef\u8bfb\u6027\u3002\n<\/p><\/blockquote>\n

\"sql\u4e2dwith\u7684\u7528\u6cd5\u63d2\u56fe\"<\/p>\n

SQL \u4e2d WITH \u5b50\u53e5\u7684\u7528\u6cd5<\/strong><\/p>\n

WITH \u5b50\u53e5\u662f\u4e00\u79cd\u4e34\u65f6\u8868\uff0c\u7528\u4e8e\u5728\u540c\u4e00\u67e5\u8be2\u4e2d\u5b9a\u4e49\u548c\u5f15\u7528\u590d\u6742\u67e5\u8be2\u3002\u5b83\u5141\u8bb8\u5c06\u91cd\u590d\u6216\u590d\u6742\u7684\u5b50\u67e5\u8be2\u5b58\u50a8\u5728\u547d\u540d\u8868\u4e2d\uff0c\u4ece\u800c\u7b80\u5316\u67e5\u8be2\u5e76\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n

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

WITH <\u4e34\u65f6\u8868\u540d> AS (\n  <\u5b50\u67e5\u8be2>\n)\nSELECT ...\nFROM <\u4e34\u65f6\u8868\u540d><\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u7528\u6cd5<\/strong><\/p>\n
    \n
  1.  \u521b\u5efa\u4e34\u65f6\u8868<\/strong>\uff1a
    WITH \u5b50\u53e5\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u8868\uff0c\u5176\u540d\u79f0\u7531 \u6307\u5b9a\u3002\u4e34\u65f6\u8868\u5728\u67e5\u8be2\u6267\u884c\u671f\u95f4\u5b58\u5728\uff0c\u4f46\u5728\u67e5\u8be2\u5b8c\u6210\u540e\u88ab\u5220\u9664\u3002<\/li>\n
  2.  \u5b9a\u4e49\u5b50\u67e5\u8be2<\/strong>\uff1a
     \u6307\u5b9a\u4e86\u8981\u5b58\u50a8\u5728\u4e34\u65f6\u8868\u4e2d\u7684\u67e5\u8be2\u7ed3\u679c\u96c6\u3002\u5b50\u67e5\u8be2\u53ef\u4ee5\u662f\u4efb\u4f55\u6709\u6548\u7684 SQL \u67e5\u8be2\u3002<\/li>\n
  3.  \u5f15\u7528\u4e34\u65f6\u8868<\/strong>\uff1a
    \u4e34\u65f6\u8868\u53ef\u4ee5\u50cf\u5e38\u89c4\u8868\u4e00\u6837\u5728\u540e\u7eed\u7684\u67e5\u8be2\u4e2d\u5f15\u7528\u3002\u4e34\u65f6\u8868\u7684\u540d\u79f0 \u7528\u4e8e\u8bbf\u95ee\u5176\u6570\u636e\u3002<\/li>\n<\/ol>\n
    \u4f18\u70b9<\/strong><\/p>\n
      \n
    •  \u4ee3\u7801\u53ef\u91cd\u7528\u6027<\/strong>\uff1aWITH \u5b50\u53e5\u5141\u8bb8\u5728\u591a\u4e2a\u5730\u65b9\u4f7f\u7528\u76f8\u540c\u7684\u590d\u6742\u5b50\u67e5\u8be2\uff0c\u4ece\u800c\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u91cd\u7528\u6027\u3002<\/li>\n
    •  \u6027\u80fd\u4f18\u5316<\/strong>\uff1a\u901a\u8fc7\u5c06\u5b50\u67e5\u8be2\u5b58\u50a8\u5728\u4e34\u65f6\u8868\u4e2d\uff0cWITH \u5b50\u53e5\u53ef\u4ee5\u907f\u514d\u5bf9\u540c\u4e00\u5b50\u67e5\u8be2\u7684\u91cd\u590d\u6267\u884c\uff0c\u4ece\u800c\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002<\/li>\n
    •  <\/strong>\uff1aWITH \u5b50\u53e5\u53ef\u4ee5\u5c06\u590d\u6742\u67e5\u8be2\u5206\u89e3\u4e3a\u66f4\u5c0f\u7684\u3001\u66f4\u6613\u4e8e\u7ba1\u7406\u7684\u5757\uff0c\u4ece\u800c\u63d0\u9ad8\u67e5\u8be2\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/li>\n<\/ul>\n
      \u793a\u4f8b<\/strong><\/p>\n
      \u8ba1\u7b97\u6bcf\u4f4d\u5458\u5de5\u7684\u5e73\u5747\u5de5\u8d44\uff1a<\/p>\n
      WITH EmployeeSalaries AS (\n  SELECT employee_id, AVG(salary) AS avg_salary\n  FROM Salaries\n  GROUP BY employee_id\n)\nSELECT *\nFROM EmployeeSalaries;<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \u7ed3\u8bba<\/strong><\/p>\n
      WITH \u5b50\u53e5\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u7528\u4e8e\u5728 SQL \u67e5\u8be2\u4e2d\u5b9a\u4e49\u548c\u5f15\u7528\u590d\u6742\u67e5\u8be2\u3002\u5b83\u63d0\u9ad8\u4e86\u4ee3\u7801\u53ef\u91cd\u7528\u6027\u3001\u6027\u80fd\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n
      \u4ee5\u4e0a\u5c31\u662fsql\u4e2dwith\u7684\u7528\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":"
      with \u5b50\u53e5\u53ef\u521b\u5efa\u4e34\u65f6\u8868\uff0c\u7528\u4e8e\u5728\u67e5\u8be2\u4e2d\u5b9a\u4e49\u590d\u6742\u67e5\u8be2\uff0c\u4ece\u800c\u63d0\u5347\u4ee3\u7801\u53ef\u91cd\u7528\u6027\u3001\u6027\u80fd\u548c\u53ef\u8bfb\u6027\u3002 SQL \u4e2d WITH \u5b50\u53e5\u7684\u7528\u6cd5 WITH \u5b50\u53e5\u662f\u4e00\u79cd\u4e34\u65f6\u8868\uff0c\u7528\u4e8e\u5728\u540c\u4e00\u67e5\u8be2\u4e2d\u5b9a\u4e49\u548c\u5f15\u7528\u590d\u6742\u67e5\u8be2\u3002\u5b83\u5141\u8bb8\u5c06\u91cd\u590d\u6216\u590d\u6742\u7684\u5b50\u67e5\u8be2\u5b58\u50a8\u5728\u547d\u540d\u8868\u4e2d\uff0c\u4ece\u800c\u7b80\u5316\u67e5\u8be2\u5e76\u63d0\u9ad8\u6027\u80fd\u3002 \u8bed\u6cd5 WITH <\u4e34\u65f6\u8868\u540d> AS ( <\u5b50\u67e5\u8be2> ) SELECT … FROM <\u4e34\u65f6\u8868\u540d> \u767b\u5f55\u540e\u590d\u5236 \u7528\u6cd5 \u521b\u5efa\u4e34\u65f6\u8868\uff1aWITH \u5b50\u53e5\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u8868\uff0c\u5176\u540d\u79f0\u7531 \u6307\u5b9a\u3002\u4e34\u65f6\u8868\u5728\u67e5\u8be2\u6267\u884c\u671f\u95f4\u5b58\u5728\uff0c\u4f46\u5728\u67e5\u8be2\u5b8c\u6210\u540e\u88ab\u5220\u9664\u3002 \u5b9a\u4e49\u5b50\u67e5\u8be2\uff1a \u6307\u5b9a\u4e86\u8981\u5b58\u50a8\u5728\u4e34\u65f6\u8868\u4e2d\u7684\u67e5\u8be2\u7ed3\u679c\u96c6\u3002\u5b50\u67e5\u8be2\u53ef\u4ee5\u662f\u4efb\u4f55\u6709\u6548\u7684 SQL \u67e5\u8be2\u3002 \u5f15\u7528\u4e34\u65f6\u8868\uff1a\u4e34\u65f6\u8868\u53ef\u4ee5\u50cf\u5e38\u89c4\u8868\u4e00\u6837\u5728\u540e\u7eed\u7684\u67e5\u8be2\u4e2d\u5f15\u7528\u3002\u4e34\u65f6\u8868\u7684\u540d\u79f0 \u7528\u4e8e\u8bbf\u95ee\u5176\u6570\u636e\u3002 \u4f18\u70b9 \u4ee3\u7801\u53ef\u91cd\u7528\u6027\uff1aWITH \u5b50\u53e5\u5141\u8bb8\u5728\u591a\u4e2a\u5730\u65b9\u4f7f\u7528\u76f8\u540c\u7684\u590d\u6742\u5b50\u67e5\u8be2\uff0c\u4ece\u800c\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u91cd\u7528\u6027\u3002 \u6027\u80fd\u4f18\u5316\uff1a\u901a\u8fc7\u5c06\u5b50\u67e5\u8be2\u5b58\u50a8\u5728\u4e34\u65f6\u8868\u4e2d\uff0cWITH \u5b50\u53e5\u53ef\u4ee5\u907f\u514d\u5bf9\u540c\u4e00\u5b50\u67e5\u8be2\u7684\u91cd\u590d\u6267\u884c\uff0c\u4ece\u800c\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002 \uff1aWITH \u5b50\u53e5\u53ef\u4ee5\u5c06\u590d\u6742\u67e5\u8be2\u5206\u89e3\u4e3a\u66f4\u5c0f\u7684\u3001\u66f4\u6613\u4e8e\u7ba1\u7406\u7684\u5757\uff0c\u4ece\u800c\u63d0\u9ad8\u67e5\u8be2\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002 \u793a\u4f8b \u8ba1\u7b97\u6bcf\u4f4d\u5458\u5de5\u7684\u5e73\u5747\u5de5\u8d44\uff1a WITH EmployeeSalaries AS ( SELECT employee_id, AVG(salary) AS avg_salary FROM Salaries GROUP BY employee_id ) SELECT […]<\/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-5181","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5181","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=5181"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5181\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5181"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5181"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5181"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}