{"id":5199,"date":"2024-11-14T09:51:34","date_gmt":"2024-11-14T01:51:34","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5199\/"},"modified":"2024-11-14T09:51:34","modified_gmt":"2024-11-14T01:51:34","slug":"sql%e4%b8%adunion-all%e7%9a%84%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5199\/","title":{"rendered":"sql\u4e2dunion all\u7684\u7528\u6cd5"},"content":{"rendered":"

\n union all \u662f sql \u4e2d\u5408\u5e76 select \u67e5\u8be2\u7ed3\u679c\u7684\u8fd0\u7b97\u7b26\uff0c\u7279\u70b9\u662f\u4e0d\u53bb\u9664\u91cd\u590d\u884c\uff0c\u7528\u4e8e\u5408\u5e76\u5177\u6709\u76f8\u540c\u5217\u548c\u6570\u636e\u7c7b\u578b\u7684\u67e5\u8be2\u7ed3\u679c\uff0c\u4f8b\u5982\u5408\u5e76\u4e0d\u540c\u8868\u7684\u6570\u636e\u3001\u9644\u52a0\u884c\u5230\u7ed3\u679c\u96c6\u7b49\uff0c\u4e0e union \u8fd0\u7b97\u7b26\u7684\u533a\u522b\u5728\u4e8e union \u4f1a\u53bb\u9664\u91cd\u590d\u884c\u3002\n<\/p><\/blockquote>\n

\"sql\u4e2dunion<\/p>\n

UNION ALL \u7684\u7528\u6cd5<\/strong><\/p>\n

\u4ec0\u4e48\u662f UNION ALL\uff1f<\/strong><\/p>\n

UNION ALL \u662f SQL \u4e2d\u4e00\u4e2a\u8fd0\u7b97\u7b26\uff0c\u7528\u4e8e\u5408\u5e76\u4e24\u4e2a\u6216\u591a\u4e2a SELECT \u67e5\u8be2\u7684\u7ed3\u679c\u3002\u5b83\u7684\u7279\u70b9\u662f\u4e0d\u53bb\u9664\u91cd\u590d\u7684\u884c\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5408\u5e76\u540e\u7684\u7ed3\u679c\u96c6\u4e2d\u5c06\u5305\u542b\u6240\u6709\u8f93\u5165\u884c\u7684\u6240\u6709\u884c\u3002<\/p>\n

\u683c\u5f0f\uff1a<\/strong><\/p>\n

SELECT \u52171, \u52172, ...\nFROM \u88681\nUNION ALL\nSELECT \u52171, \u52172, ...\nFROM \u88682;<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u5982\u4f55\u4f7f\u7528 UNION ALL\uff1f<\/strong><\/p>\n
UNION ALL \u7528\u4e8e\u5408\u5e76\u5177\u6709\u76f8\u540c\u5217\u548c\u6570\u636e\u7c7b\u578b\u7684\u67e5\u8be2\u7ed3\u679c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u7528\u4f8b\uff1a<\/p>\n
    \n
  •  \u5408\u5e76\u6765\u81ea\u4e0d\u540c\u8868\u7684\u6570\u636e\uff1a<\/strong>\u60a8\u53ef\u4ee5\u4f7f\u7528 UNION ALL \u5c06\u6765\u81ea\u4e0d\u540c\u8868\u7684\u6570\u636e\u5408\u5e76\u5230\u5355\u4e2a\u7ed3\u679c\u96c6\u4e2d\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n
    SELECT * FROM \u88681\nUNION ALL\nSELECT * FROM \u88682;<\/pre>\n
      \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
      \n
    •  \u9644\u52a0\u884c\u5230\u73b0\u6709\u7ed3\u679c\u96c6\uff1a<\/strong>\u60a8\u53ef\u4ee5\u4f7f\u7528 UNION ALL \u5c06\u5176\u4ed6\u884c\u9644\u52a0\u5230\u73b0\u6709\u7684\u67e5\u8be2\u7ed3\u679c\u96c6\u4e2d\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n
      SELECT * FROM \u88681\nUNION ALL\nVALUES (10, '\u65b0\u884c');<\/pre>\n
        \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
        \n
      •  \u53bb\u9664\u91cd\u590d\u884c\uff1a<\/strong>Union ALL \u4e0d\u4f1a\u53bb\u9664\u91cd\u590d\u884c\u3002\u5982\u679c\u60a8\u9700\u8981\u53bb\u9664\u91cd\u590d\u884c\uff0c\u53ef\u4ee5\u6539\u7528 UNION \u8fd0\u7b97\u7b26\u3002<\/li>\n<\/ul>\n
        UNION ALL \u4e0e UNION \u7684\u533a\u522b<\/strong><\/p>\n
          \n
        • UNION \u4f1a\u53bb\u9664\u91cd\u590d\u884c\uff0c\u800c UNION ALL \u5219\u4e0d\u4f1a\u3002<\/li>\n
        • UNION ALL \u901a\u5e38\u6bd4 UNION \u6548\u7387\u66f4\u9ad8\uff0c\u56e0\u4e3a\u5b83\u4e0d\u9700\u8981\u5904\u7406\u91cd\u590d\u884c\u3002<\/li>\n<\/ul>\n
          \u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n
            \n
          • UNION ALL \u4ec5\u5408\u5e76\u5177\u6709\u76f8\u540c\u5217\u548c\u6570\u636e\u7c7b\u578b\u7684\u67e5\u8be2\u7ed3\u679c\u3002<\/li>\n
          • \u5982\u679c\u67e5\u8be2\u7ed3\u679c\u4e2d\u5b58\u5728 NULL \u503c\uff0c\u5219 UNION ALL \u4f1a\u5c06 NULL \u503c\u89c6\u4e3a\u76f8\u540c\u503c\u3002<\/li>\n<\/ul>\n
            \u4ee5\u4e0a\u5c31\u662fsql\u4e2dunion all\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":"
            union all \u662f sql \u4e2d\u5408\u5e76 select \u67e5\u8be2\u7ed3\u679c\u7684\u8fd0\u7b97\u7b26\uff0c\u7279\u70b9\u662f\u4e0d\u53bb\u9664\u91cd\u590d\u884c\uff0c\u7528\u4e8e\u5408\u5e76\u5177\u6709\u76f8\u540c\u5217\u548c\u6570\u636e\u7c7b\u578b\u7684\u67e5\u8be2\u7ed3\u679c\uff0c\u4f8b\u5982\u5408\u5e76\u4e0d\u540c\u8868\u7684\u6570\u636e\u3001\u9644\u52a0\u884c\u5230\u7ed3\u679c\u96c6\u7b49\uff0c\u4e0e union \u8fd0\u7b97\u7b26\u7684\u533a\u522b\u5728\u4e8e union \u4f1a\u53bb\u9664\u91cd\u590d\u884c\u3002 UNION ALL \u7684\u7528\u6cd5 \u4ec0\u4e48\u662f UNION ALL\uff1f UNION ALL \u662f SQL \u4e2d\u4e00\u4e2a\u8fd0\u7b97\u7b26\uff0c\u7528\u4e8e\u5408\u5e76\u4e24\u4e2a\u6216\u591a\u4e2a SELECT \u67e5\u8be2\u7684\u7ed3\u679c\u3002\u5b83\u7684\u7279\u70b9\u662f\u4e0d\u53bb\u9664\u91cd\u590d\u7684\u884c\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5408\u5e76\u540e\u7684\u7ed3\u679c\u96c6\u4e2d\u5c06\u5305\u542b\u6240\u6709\u8f93\u5165\u884c\u7684\u6240\u6709\u884c\u3002 \u683c\u5f0f\uff1a SELECT \u52171, \u52172, … FROM \u88681 UNION ALL SELECT \u52171, \u52172, … FROM \u88682; \u767b\u5f55\u540e\u590d\u5236 \u5982\u4f55\u4f7f\u7528 UNION ALL\uff1f UNION ALL \u7528\u4e8e\u5408\u5e76\u5177\u6709\u76f8\u540c\u5217\u548c\u6570\u636e\u7c7b\u578b\u7684\u67e5\u8be2\u7ed3\u679c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u7528\u4f8b\uff1a \u5408\u5e76\u6765\u81ea\u4e0d\u540c\u8868\u7684\u6570\u636e\uff1a\u60a8\u53ef\u4ee5\u4f7f\u7528 UNION ALL \u5c06\u6765\u81ea\u4e0d\u540c\u8868\u7684\u6570\u636e\u5408\u5e76\u5230\u5355\u4e2a\u7ed3\u679c\u96c6\u4e2d\u3002\u4f8b\u5982\uff1a SELECT * FROM \u88681 UNION […]<\/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-5199","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5199","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=5199"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5199\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5199"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5199"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}