SELECT DISTINCT ON expressions must match initial ORDER BY expressions<\/p><\/blockquote>\n\n\n\n
\u6839\u636e\u8fd9\u4e2a\u9519\u8bef\uff0c\u6211\u4eec\u67e5\u8be2\u5b98\u65b9\u6587\u6863\u5f97\u77e5\uff1a<\/p>\n\n\n\n
DISTINCT ON ( expression [, \u2026] ) keeps only the first row of each set of rows where the given expressions evaluate to equal. [\u2026]\u3002 Note that the \u201cfirst row\u201d of each set is unpredictable unless ORDER BY is used to ensure that the desired row appears first. [\u2026]\u3002 The DISTINCT ON expression(s) must match the leftmost ORDER BY expression(s)\u3002<\/p><\/blockquote>\n\n\n\n
\u7ffb\u8bd1\u8fc7\u6765\u7684\u610f\u601d\u662f DISTINCT ON ( expression [, \u2026] )\u628a\u8bb0\u5f55\u6839\u636e[, \u2026]\u7684\u503c\u8fdb\u884c\u5206\u7ec4\uff0c\u5206\u7ec4\u4e4b\u540e\u4ec5\u8fd4\u56de\u6bcf\u4e00\u7ec4\u7684\u7b2c\u4e00\u884c\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u4f60\u4e0d\u6307\u5b9aORDER BY\u5b50\u53e5\uff0c\u8fd4\u56de\u7684\u7b2c\u4e00\u6761\u7684\u4e0d\u786e\u5b9a\u7684\u3002\u5982\u679c\u4f60\u4f7f\u7528\u4e86ORDER BY \u5b50\u53e5\uff0c\u90a3\u4e48[, \u2026]\u91cc\u9762\u7684\u503c\u5fc5\u987b\u9760\u8fd1ORDER BY\u5b50\u53e5\u7684\u6700\u5de6\u8fb9\u3002<\/p>\n\n\n\n
select distinct on(age) id,name,age,sex from xttblog;<\/code><\/pre>\n\n\n\n\u4e0a\u9762\u8fd9\u4e2a\u8bed\u53e5\uff0c\u7531\u4e8e\u6ca1\u6709\u6dfb\u52a0 ORDER BY \u5b50\u53e5\uff0c\u6240\u4ee5\u5c31\u6709\u53ef\u80fd\u5728\u6267\u884c\u65f6\u62a5 SELECT DISTINCT ON expressions must match initial ORDER BY expressions\u3002<\/p>\n\n\n\n
\u53e6\u5916\u5982\u679c\u6307\u5b9a\u4e86 ORDER BY \u5b50\u53e5\uff0c\u4f46\u662f DISTINCT ON \u4e2d\u7684\u5b57\u6bb5\u4e0d\u5728 ORDER BY \u8bed\u53e5\u7684\u6700\u5de6\u8fb9\uff0c\u4e5f\u4f1a\u62a5 SELECT DISTINCT ON expressions must match initial ORDER BY expressions \u9519\u8bef\u3002<\/p>\n\n\n\n
select distinct on(age) id,name,age,sex from xttblog order by id,name;<\/code><\/pre>\n\n\n\n\u4ee5\u4e0a\uff0c\u5e0c\u671b\u80fd\u591f\u5e2e\u52a9\u5230\u5927\u5bb6\uff01\u5982\u679c\u8fd8\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u6dfb\u52a0\u6211\u7684\u5fae\u4fe1\uff0c\u4e00\u8d77\u7cbe\u8fdb\uff01<\/p>\n
<\/p>
\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1axttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p>
\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a\u4e1a\u4f59\u8349<\/a>\uff1a » \u89e3\u51b3 SELECT DISTINCT ON expressions must match initial ORDER BY expressions \u7684\u6559\u7a0b<\/a><\/p>","protected":false},"excerpt":{"rendered":"
\u4e00\u822c\u6211\u4eec\u9488\u5bf9\u6392\u91cd\u6709\u4e24\u79cd\u5feb\u901f\u7684\u65b9\u6cd5\u3002\u4e00\u79cd\u662f DISTINCT\uff0c\u4e00\u79cd\u662f GROUP BY\u3002\u4f46\u662f GROUP BY […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[2024,2026,83,2025,429],"class_list":["post-4527","post","type-post","status-publish","format-standard","hentry","category-sql","tag-distinct","tag-group-by","tag-mysql","tag-order-by","tag-postgresql"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4527","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4527"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4527\/revisions"}],"predecessor-version":[{"id":4528,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4527\/revisions\/4528"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4527"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4527"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}