{"id":200582,"date":"2025-05-06T13:51:23","date_gmt":"2025-05-06T05:51:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200582\/"},"modified":"2025-05-06T13:51:23","modified_gmt":"2025-05-06T05:51:23","slug":"go-%e4%b8%ad-gorm-%e7%9a%84-distinct-%e6%93%8d%e4%bd%9c%ef%bc%9a%e7%b4%a2%e5%bc%95%e5%a6%82%e4%bd%95%e5%bd%b1%e5%93%8d%e7%bb%93%e6%9e%9c%e7%9a%84%e6%8e%92%e5%ba%8f%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200582\/","title":{"rendered":"Go \u4e2d GORM \u7684 Distinct() \u64cd\u4f5c\uff1a\u7d22\u5f15\u5982\u4f55\u5f71\u54cd\u7ed3\u679c\u7684\u6392\u5e8f\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>Go \u4e2d GORM \u7684 Distinct() \u64cd\u4f5c\uff1a\u7d22\u5f15\u5982\u4f55\u5f71\u54cd\u7ed3\u679c\u7684\u6392\u5e8f\uff1f<\/h1>\n<p>\u4eca\u65e5\u4e0d\u80af\u57cb\u5934\uff0c\u660e\u65e5\u4f55\u4ee5\u62ac\u5934\uff01\u6bcf\u65e5\u4e00\u53e5\u52aa\u529b\u81ea\u5df1\u7684\u8bdd\u54c8\u54c8~\u54c8\u55bd\uff0c\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\uff0c\u4e3b\u8981\u5185\u5bb9\u662f\u8bb2\u89e3\u7b49\u7b49\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u53ef\u4ee5\u6536\u85cf\u6216\u8005\u6709\u66f4\u597d\u7684\u5efa\u8bae\u5728\u8bc4\u8bba\u63d0\u51fa\uff0c\u6211\u90fd\u4f1a\u8ba4\u771f\u770b\u7684\uff01\u5927\u5bb6\u4e00\u8d77\u8fdb\u6b65\uff0c\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241109\/1731110966672ea836a91d6.jpg\" class=\"aligncenter\"><\/p>\n<h2>\u7d22\u5f15\u5982\u4f55\u5f71\u54cd DISTINCT \u6392\u5e8f<\/h2>\n<p>\u5728 Go \u8bed\u8a00\u4e2d\uff0c\u4f7f\u7528 GORM \u6846\u67b6\u5bf9\u6570\u636e\u5e93\u8fdb\u884c\u64cd\u4f5c\u65f6\uff0c\u5982\u679c\u5bf9\u67e5\u8be2\u7ed3\u679c\u6267\u884c Distinct() \u64cd\u4f5c\uff0c\u518d\u4e0d\u6307\u5b9a ORDER BY \u6761\u4ef6\u7684\u60c5\u51b5\u4e0b\uff0c\u6392\u5e8f\u89c4\u5219\u4f1a\u53d7\u5230\u7d22\u5f15\u7684\u5f71\u54cd\u3002<\/p>\n<p><strong>\u95ee\u9898\uff1a<\/strong><\/p>\n<p>\u4ee5\u4e00\u4e2a\u884c\u653f\u533a\u5212\u8868\u7684\u4f8b\u5b50\u4e3a\u4f8b\uff0c\u5047\u8bbe\u6709 Province\u3001Prefecture \u548c County \u4e09\u4e2a\u5b57\u6bb5\uff0c\u5176\u4e2d Province \u52a0\u4e86\u7d22\u5f15\u3002\u5f53\u4e0d\u542f\u7528\u7d22\u5f15\u65f6\uff0cDistinct() \u64cd\u4f5c\u540e\u7684\u7ed3\u679c\u4f1a\u6309\u7167\u4e3b\u952e\u6392\u5e8f\u3002\u4f46\u662f\uff0c\u5f53 Province \u4e0a\u542f\u7528\u7d22\u5f15\u540e\uff0c\u6392\u5e8f\u89c4\u5219\u4f1a\u53d1\u751f\u53d8\u5316\u3002<\/p>\n<p><strong>\u7b54\u6848\uff1a<\/strong><\/p>\n<p>SQL \u6807\u51c6\u6ca1\u6709\u5b9a\u4e49\u672a\u6307\u5b9a ORDER BY \u65f6\u7684\u786e\u5207\u6392\u5e8f\u987a\u5e8f\uff0c\u56e0\u6b64\u7531\u6570\u636e\u5e93\u7cfb\u7edf\u548c\u5e95\u5c42\u5b58\u50a8\u5f15\u64ce\u51b3\u5b9a\u3002\u4ee5 MySQL \u4e2d\u5e38\u7528\u7684 InnoDB \u5b58\u50a8\u5f15\u64ce\u4e3a\u4f8b\uff1a<\/p>\n<ul>\n<li>\u5f53\u6ca1\u6709\u5339\u914d\u7684\u4e8c\u7ea7\u7d22\u5f15\u65f6\uff0cMySQL \u4f1a\u4f7f\u7528\u4e3b\u952e\u7d22\u5f15\uff0c\u56e0\u6b64\u7ed3\u679c\u4f1a\u6309\u7167\u4e3b\u952e\u6392\u5e8f\u3002<\/li>\n<li>\u5f53\u4f7f\u7528\u4e8c\u7ea7\u7d22\u5f15\u65f6\uff0c\u7ed3\u679c\u4f1a\u6309\u7167\u4e8c\u7ea7\u7d22\u5f15\u7684\u987a\u5e8f\u6392\u5e8f\u3002<\/li>\n<\/ul>\n<p>\u5728\u4e0a\u8ff0\u884c\u653f\u533a\u5212\u8868\u4e2d\uff0c\u5f53 Province \u4e0a\u542f\u7528\u7d22\u5f15\u65f6\uff0cDistinct() \u64cd\u4f5c\u540e\uff0c\u7ed3\u679c\u4f1a\u6309\u7167 Province \u7d22\u5f15\u7684\u987a\u5e8f\u8fdb\u884c\u6392\u5e8f\uff0c\u800c\u4e0d\u662f\u4e3b\u952e\u987a\u5e8f\u3002<\/p>\n<p>\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6570\u636e\u5e93\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>Go \u4e2d GORM \u7684 Dist&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200582","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200582","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200582"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200582\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200582"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200582"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200582"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}