{"id":2117,"date":"2020-03-20T18:23:44","date_gmt":"2020-03-20T10:23:44","guid":{"rendered":"https:\/\/blog.miahavero.me\/?p=2117"},"modified":"2020-03-20T18:23:44","modified_gmt":"2020-03-20T10:23:44","slug":"sql-join%e7%9a%84%e9%80%bb%e8%be%91%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/blog.miahavero.me\/?p=2117","title":{"rendered":"SQL join\u7684\u903b\u8f91\u95ee\u9898"},"content":{"rendered":"\n<p>\u5de5\u4f5c\u4e0a\u9047\u5230\u4e00\u4e2a\u591a\u5bf9\u591ajoin\u7684\u903b\u8f91\u95ee\u9898\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>\u8981\u628a\u4f18\u60e0\u5238\u4f7f\u7528\u6570\u636e\uff08\u4f18\u60e0\u5238\u91d1\u989d\uff0c\u4f18\u60e0\u5238\u53d1\u653e\u65f6\u95f4\u3001\u4f18\u60e0\u89c4\u5219\u548c\u4f18\u60e0\u6d3b\u52a8\u7b49\u4fe1\u606f\uff09\uff0c\u548c\u4f7f\u7528\u4f18\u60e0\u5238\u7684\u9500\u552e\u4fe1\u606f\uff08\u4e70\u4e86\u4ec0\u4e48\u5546\u54c1\uff0c\u5546\u54c1\u4ef7\u683c\u591a\u5c11\uff0c\u5546\u54c1\u54c1\u7c7b\u7b49\u7b49\uff09join\u5230\u4e00\u8d77\u3002\u56e0\u4e3a\u79cd\u79cd\u539f\u56e0\uff0c\u8fd9\u4e24\u4e2a\u6570\u636e\u6ca1\u6cd5\u5bf9\u8d77\u6765\uff0c\u4e00\u4e2a\u7cfb\u7edf\u6ca1\u6709\u8bb0\u5f55\u53e6\u4e00\u4e2a\u7cfb\u7edf\u7684\u903b\u8f91\u6216\u8005\u6d41\u6c34PK\u3002<\/p>\n\n\n\n<p>\u5f53N:1 join\u7684\u65f6\u5019\uff0c1\u7684\u90a3\u6761\u6570\u636e\u4f1a\u91cd\u590d\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1442\" height=\"482\" src=\"https:\/\/blog.miahavero.me\/wp-content\/uploads\/2020\/03\/image.png\" alt=\"\" class=\"wp-image-2118\"\/><\/figure>\n\n\n\n<p>\u8fd9\u65f6\uff0c\u6700\u7ec8\u7ed3\u679c\u8868\u91cc\u7684\u9500\u552e\u989d\u5982\u679c\u76f4\u63a5\u76f8\u52a0\uff0c\u5c31\u4f1a\u5f97\u5230200\uff0c\u548c\u5b9e\u9645\u60c5\u51b5\u4e0d\u7b26\u3002\u5b9e\u9645\u4e0a\uff0c\u8fd9\u4e2a\u9879\u76ee\u8981\u505a\u7684\u8868\u539f\u5148\u6709\u4e00\u4e2a\u7248\u672c\uff0c\u5c31\u662f\u8fd9\u6837\u5b58\u6570\u636e\u7684\u3002\u6211\u89c9\u5f97\u8fd9\u6837\u5f88\u4e0d\u597d\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u8868\u5c31\u4e0d\u7b26\u5408\u4e00\u822c\u7684\u6570\u636e\u5e93\u89c4\u8303\u3002\u6211\u4eec\u7528\u8fd9\u4e2a\u8868\u7684\u65f6\u5019\u5fc5\u987b\u628a100\u53bb\u91cd\u4ee5\u540e\u518d\u7528\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-- wrong\nselect sum(&#91;merchandise value])\nfrom joined_table\n;\n\n-- correct\nselect sum(&#91;merchandise value])\nfrom (\n  select\n   &#91;coupon PK]\n  ,&#91;sales ID]\n  ,max(&#91;merchandise value]) as &#91;merchandise value]\n  from joined_table\n  group by 1,2\n) a\n;<\/code><\/pre>\n\n\n\n<p>\u5f531:M join\u7684\u65f6\u5019\uff0c\u540c\u6837\u7684\uff0c1\u7684\u8bb0\u5f55\u4f1a\u91cd\u590d\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1447\" height=\"491\" src=\"https:\/\/blog.miahavero.me\/wp-content\/uploads\/2020\/03\/image-1.png\" alt=\"\" class=\"wp-image-2119\"\/><\/figure>\n\n\n\n<p>\u4f18\u60e0\u5238\u662f5\u5757\u94b1\uff0c\u5982\u679creporting\u7684\u65f6\u5019\u7b97\u6210\u4e8610\u5757\u94b1\u5c31\u4e0d\u5bf9\u4e86\u3002\u6309\u7406\u8bf4\u8fd9\u79cd\u60c5\u51b5\u4e5f\u53ef\u4ee5\u6309\u7167\u4e0a\u9762\u90a3\u79cd\u529e\u6cd5\u5904\u7406\u3002\u7136\u800c\u73b0\u5728\u7684\u60c5\u51b5\u662f\uff0c\u6700\u7ec8\u6211\u4eec\u7684\u662fM:N\u7684join\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1888\" height=\"703\" src=\"https:\/\/blog.miahavero.me\/wp-content\/uploads\/2020\/03\/image-2.png\" alt=\"\" class=\"wp-image-2120\"\/><\/figure>\n\n\n\n<p>\u6211\u60f3\u51fa\u7684\u89e3\u51b3\u65b9\u6cd5\u662f\uff0c\u6570\u4e00\u4e0b\u90a3\u4e2a\u503c\u91cd\u590d\u4e86\u51e0\u6b21\uff0c\u7136\u540e\u628a\u503c\u62c6\u5f00\u6765\uff0c\u6bd4\u5982\u5982\u4e0a\u56fe\u9664\u4e00\u4e0b\u5e73\u5747\u5206\u644a\uff08\u6700\u7ec8\u6211\u6309\u7167\u53e6\u4e00\u7aef\u7684\u6570\u503c\u52a0\u6743\u5e73\u5747\u7684\uff09\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>select\na.&#91;coupon code]\n,a.&#91;coupon PK]\n,a.&#91;detail amount]\/sum(1)over(partition by a.&#91;coupon PK]) &#91;detail amount deduped]\n,b.&#91;sales ID]\n,b.&#91;merchandise value]\/sum(1)over(partition by b.&#91;sales ID]) &#91;merchandise value deduped]\nfrom &#91;coupon table] a\njoin &#91;sales table] b\non a.&#91;join keys]=b.&#91;join keys]\n;<\/code><\/pre>\n\n\n\n<p>\u8bf4\u4e00\u4e0b\u611f\u60f3\uff1a\u6211\u4ece\u6765\u6ca1\u6709\u9047\u5230\u8fc7\u5fc5\u987b\u591a\u5bf9\u591ajoin\u7684\u7edf\u8ba1\u6570\u636e\u3002\u6709\u65f6\u5019\u6211\u4eec\u9700\u8981\u903b\u8f91\u4e0a\u7684\u591a\u5bf9\u591ajoin\uff0c\u6bd4\u5982\u628a\u51e0\u4e2a\u65e5\u671f\u5206\u914d\u5230\u4e00\u4e2a\u8868\u91cc\u7684\u6240\u6709\u8bb0\u5f55\u4e0a\u3002\u4f46\u662f\u5bf9\u4e8e\u7edf\u8ba1metrics\u7684\u8868\uff0c\u5982\u679cjoin\u5728\u4e0d\u7406\u89e3\u7684\u5b57\u6bb5\u4e0a\uff0c\u5c31\u8981\u770b\u4e00\u4e0b\u662f\u4e0d\u662f\u6709join\u5b57\u6bb5\u9020\u6210\u6570\u636e\u91cd\u590d\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u9879\u76ee\u6218\u7ebf\u5927\u6982\u6709\u4e00\u5e74\u3002\u548c\u6240\u6709\u7684\u4e8b\u60c5\u4e00\u6837\uff0c\u6b63\u5728\u53d1\u751f\u65f6\u96be\u4ee5\u50cf\u4e0a\u9762\u90a3\u6837\u6982\u62ec\u51fa\u95ee\u9898\u75c7\u7ed3\u3002\u6211\u4e00\u5f00\u59cb\u4ee5\u4e3a\uff0c\u4e24\u79cd\u6570\u636e\u53ef\u4ee5\u6709\u5f88\u6e05\u6670\u7684\u5173\u8054\u3002\u6ca1\u60f3\u5230\uff0c\u6bcf\u6b21\u770b\u89c1\u4e0d\u592a\u5bf9\u7684\u5730\u65b9\uff0c\u8ffd\u95ee\u4e86\u4ee5\u540e\u5f97\u5230\u7684\u5efa\u8bae\u662f\u770b\u53e6\u4e00\u79cd\u6570\u636e\u3002\u800c\u5b58\u6570\u636e\u7684\u4e00\u65b9\uff0c\u73b0\u5728\u603b\u662f\u628a\u6570\u636e\u90fd\u5b58\u5230\u4e00\u4e2ajson\u91cc\u9762\u53bb\u3002\u5f53\u4f60\u5728\u6570\u636e\u5e93\u91cc\u5b58json\u7684\u65f6\u5019\uff0c\u5176\u5b9e\u7ecf\u5e38\u5c31\u662f\u6253\u7834\u6570\u636e\u5e93\u539f\u6709\u7684\u5173\u7cfb\u3002\u4e3a\u4e86\u5206\u6790\u8fd9\u4e9bjson\u6211\u628a\u5b58\u4e86\u597d\u591a\u5e74\u7684\u8868\u6574\u4e2a\u91cd\u5efa\u4e86\u597d\u51e0\u6b21\u3002\u56e0\u4e3a\u89e3\u5f00\u4e86json\u91cc\u5b58\u7684\u6570\u636e\uff0c\u4e0a\u8ff0\u7684coupon\u6570\u636e\u8868\u7684PK\u5c31\u53d8\u5f97\u6a21\u7cca\uff0c\u66f4\u8ba9\u4eba\u770b\u4e0d\u6e05\u6570\u636e\u91cd\u590d\u4e86\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u9879\u76ee\u53e6\u5916\u4e00\u4e2a\u5947\u8469\u7684\u5730\u65b9\u662f\uff0c\u6570\u636e\u6211\u6700\u7ec8\u662f\u5206\u62105\u5757\u75285\u79cd\u5b57\u6bb5\u7ec4\u5408join\u7684\u3002\u5176\u4e2d4\u79cd\u6709\u591a\u5bf9\u591a\u7684\u60c5\u51b5\u3002\u597d\u51e0\u4e2ajoin\u662f\u6211\u8089\u773c\u89c2\u6d4b\u5230\u53ef\u80fd\u53ef\u4ee5join\u7136\u540e\u627e\u4eba\u786e\u8ba4\u7684\u3002\u6211\u591a\u6b21\u8ddf\u540c\u4e8b\u5ba3\u79f0\u6211\u89c9\u5f97\u8fd9\u6837\u5f88\u4e0d\u9760\u8c31\u3002\u800c\u6211\u7684pm\u65e0\u6cd5\u7406\u89e3\u6570\u636e\u3002\u6211\u6ca1\u6cd5\u8ba9\u4ed6\u7406\u89e3\u6211\u7684\u91cd\u590d\u5e76\u4e0d\u662f\u2018\u591a\u4e2acoupon\u7528\u5728\u4e86\u591a\u4e2a\u5546\u54c1\u4e0a\u2019\u8fd9\u4e48\u7b80\u5355\uff08\u6211\u8089\u773c\u89c2\u6d4b\u5230\u7684join\u662f\u4e0d\u662f\u5c31\u4ee3\u8868\u4e86\u4e24\u7aef\u7684\u8fd9\u4e2a\u6570\u636e\u4e00\u5b9a\u6709\u5173\u8054\u4e5f\u4e0d\u662f\u786e\u5b9a\u7684\uff09\u3002\u800c\u6211\u7684\u540c\u4e8b\u8c01\u4e5f\u4e0d\u89c9\u5f97\u8fd9\u79cd\u6570\u636e\u6709\u4ec0\u4e48\u4e0d\u5bf9\u7684\u3002\u8fd9\u4ef6\u4e8b\u8ba9\u6211\u5341\u5206\u5d29\u6e83\u3002\u6211\u540c\u4e8b\u8fd8\u95ee\u6211\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u50cf\u4ee5\u524d\u90a3\u6837\u628a\u91cd\u590d\u7684\u6570\u503c\u5b58\u5728\u8868\u91cc\u3002\uff08\u4e24\u4e2a\u6709\u91cd\u590d\u7684\u5b57\u6bb5\uff0c\u5e76\u4e14\u5728\u4e0d\u540c\u7684group\u91cc\u91cd\u590d\uff0c\u5c31\u662f\u6ca1\u529e\u6cd5\u5199\u51fa\u4e0a\u9762\u90a3\u79cdSQL\u6765\u4f7f\u7528\u8fd9\u4e2a\u6570\u636e\u7684\u3002\uff09<\/p>\n\n\n\n<p>\u6211\u5176\u5b9e\u662f\u5f88\u559c\u6b22\u89e3\u51b3\u65b0\u95ee\u9898\u7684\u3002\u4f46\u662f\u8fd9\u4e2a\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848\u5b8c\u5168\u662f\u4e3a\u4e86\u5b8c\u6210\u800c\u5199\u7684\uff0c\u6700\u7ec8\u5e76\u6ca1\u6709\u53cd\u6620\u6570\u636e\u903b\u8f91\uff08\u4e3b\u8981\u662fPM\u4e5f\u4e0d\u613f\u53bb\u7406\u89e3\u4e1a\u52a1\u7684\u903b\u8f91\uff09\uff0c\u8ba9\u4eba\u96be\u53d7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5de5\u4f5c\u4e0a\u9047\u5230\u4e00\u4e2a\u591a\u5bf9\u591ajoin\u7684\u903b\u8f91\u95ee\u9898\u5982\u4e0b\uff1a 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