{"id":93852,"date":"2020-04-17T22:40:17","date_gmt":"2020-04-17T14:40:17","guid":{"rendered":"http:\/\/4563.org\/?p=93852"},"modified":"2020-04-17T22:40:17","modified_gmt":"2020-04-17T14:40:17","slug":"%e9%81%87%e5%88%b0%e4%b8%80%e4%b8%aa-postgresql-%e5%be%88%e5%a5%87%e8%91%a9%e7%9a%84%e6%8e%92%e5%ba%8f%e9%97%ae%e9%a2%98%ef%bc%88bug%ef%bc%9f%ef%bc%89","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=93852","title":{"rendered":"\u9047\u5230\u4e00\u4e2a PostgreSQL \u5f88\u5947\u8469\u7684\u6392\u5e8f\u95ee\u9898\uff08BUG\uff1f\uff09"},"content":{"rendered":"
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\u9047\u5230\u4e00\u4e2a PostgreSQL \u5f88\u5947\u8469\u7684\u6392\u5e8f\u95ee\u9898\uff08BUG\uff1f\uff09 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : imherer <\/span> <\/i> 22<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u6211\u6709\u4e00\u5f20 goods \u8868\u4e3b\u8981\u6709 id \u3001name \u3001recommend \u8fd9 3 \u4e2a\u5b57\u6bb5\uff0c\u5176\u4e2d id \u4e3a\u81ea\u589e\u4e3b\u952e\uff0cname \u4e3a\u5b57\u7b26\u4e32\uff0crecommend \u4e3a int<\/p>\n

\u6211\u5f80\u8868\u91cc\u63d2\u4e86 37 \u6761\u6d4b\u8bd5\u6570\u636e\uff0cid \u4ece 1-37\uff0c\u5176\u4e2d id=1 \u7684 recommend \u4e3a 0\uff0c\u5176\u4ed6\u5269\u4e0b 36 \u6761\u5168\u4e3a 0<\/p>\n

\u5728\u63d2\u5165 37 \u6761\u6d4b\u8bd5\u6570\u636e\u540e\uff0c\u6211\u4fee\u6539\u8fc7\u90e8\u5206\u6570\u636e\u7684 name \u503c\uff0c\u4e8e\u662f\u5f53\u6211\u4f7f\u7528\u5982\u4e0b SQL \u8bed\u53e5<\/p>\n

SELECT * FROM goods ORDER BY recommend DESC; <\/code><\/pre>\n
\u8fd4\u56de\u7684\u7ed3\u679c id=1 \u7684\u6392\u5728\u7b2c\u4e00\u4f4d\uff0c\u5269\u4e0b\u7684 36 \u6309\u81ea\u589e id \u968f\u673a\u6392\u5217\u3002\u5176\u4e2d id=2 \u7684\u8fd9\u6761\u8bb0\u5f55\u6392\u5728\u5012\u6570\u7b2c\u4e8c\u4f4d\uff08\u91cd\u70b9\u5c31\u662f\u8fd9\u4e00\u6761\u8bb0\u5f55\uff09\u3002<\/p>\n
\u73b0\u5728\u9047\u5230\u4e00\u4e2a\u6bd4\u8f83\u5947\u8469\u7684\u95ee\u9898\uff0c\u6211\u5206\u9875\u83b7\u53d6\u7684\u65f6\u5019<\/p>\n
SELECT * FROM mall.goods  ORDER BY recommend DESC LIMIT 10 OFFSET 0; <\/code><\/pre>\n
\u4e0a\u9762\u8fd9\u6761 SQL \u8bed\u53e5\u5c45\u7136\u7b2c\u4e8c\u6761\u8bb0\u5f55\u662f id=2 \u7684\u6570\u636e<\/p>\n
SELECT * FROM mall.goods  ORDER BY recommend DESC LIMIT 10 OFFSET 30; <\/code><\/pre>\n
\u540c\u6837\uff0c\u4e0a\u9762\u8fd9\u6761 SQL \u8bed\u53e5\u91cc\u4e5f\u51fa\u73b0\u4e86 id=2 \u7684\u6570\u636e\uff0c\u4e0d\u8fc7\u5b83\u51fa\u73b0\u7684\u4f4d\u7f6e\u662f\u5728\u5012\u6570\u7b2c\u4e8c\u4f4d\uff0c\u548c\u7b2c\u4e00\u6761 SQL \u8bed\u53e5\u6392\u5e8f\u51fa\u73b0\u7684\u4f4d\u7f6e\u4e00\u81f4<\/p>\n
\u8fd9\u5565\u60c5\u51b5\uff1f<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (19<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : reus <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 id \u53c8\u4e0d\u5728\u6392\u5e8f\u5b57\u6bb5\u91cc\uff0c\u6709\u4ec0\u4e48\u95ee\u9898\uff1f\u5efa\u8bae\u91cd\u4fee SQL                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : zhaoce <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u95ee\u9898\u5728\u54ea\u91cc\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : imherer <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @reus 
    @zhaoce 
    \u95ee\u9898\u662f OFFSET 0 \u548c 30 \u90fd\u51fa\u73b0\u4e86 id=2 \u7684\u6570\u636e\uff0c \u6309 recommend \u4e86\u6392\u5e8f\u4e0d\u5e94\u8be5\u53ea\u51fa\u73b0\u4e00\u6b21\u5417\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : Vegetable <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4f60\u7684 recommend \u90fd\u662f 0? \u662f\u4f60\u53d1\u5e16\u5199\u9519\u4e86\u5417?                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : imherer <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @Vegetable id=1 \u7684 recommend=1\uff0c\u5269\u4f59 36 \u6761\u90fd\u662f 0                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : allAboutDbmss <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6709\u6570\u636e\u96c6\u5417\uff1f\u6211\u53ef\u4ee5\u672c\u5730\u8bd5\u4e00\u4e0b\uff1f
    `LIMIT`\u4e0d\u4e00\u5b9a\u4fdd\u8bc1\u987a\u5e8f\u3002\u4f60\u53ef\u4ee5\u7528`rank()`\u6216\u8005`dense_rank()`\u8fd9\u4fe9\u7a97\u53e3\u51fd\u6570\uff0c\u6211\u89c9\u5f97\u80fd\u4fdd\u8bc1\u6b63\u786e\u6027\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
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     \u8cc7\u6df1\u5927\u4f6c : reus <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @imherer \u4e24\u6761\u8bed\u53e5\uff0c\u7ed3\u679c\u662f\u4e92\u76f8\u72ec\u7acb\u7684\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : bagel <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e0d\u53ef\u80fd\u662f bug\uff0c\u8fd9\u79cd\u8eab\u7ecf\u767e\u6218\u7684\u4ea7\u54c1\u80fd\u8ba9\u4f60\u7b80\u5355\u8bd5\u51fa bug \u5c31\u89c1\u9b3c\u4e86\u3002<\/p>\n
    \u56e0\u4e3a\u4f60 order by \u6ca1\u6709\u6307\u5b9a\u5168\uff0cSQL \u89c4\u8303\u91cc\u5bf9\u8fd9\u79cd\u60c5\u51b5\u7684\u6392\u5e8f\u662f\u672a\u5b9a\u4e49\uff08\u6307\u6ca1\u6709\u88ab order by \u6307\u5b9a column \u7684\u987a\u5e8f\uff09\uff0c\u4e5f\u5c31\u662f\u600e\u4e48\u6392\u90fd\u53ef\u4ee5\uff0c\u770b\u5b9e\u73b0\u8005\u65b9\u4fbf\u3002\u540c\u4e00\u4e2a\u8bed\u53e5 PostgreSQL \u8fd9\u6b21\u8fd4\u56de\u4e00\u4e2a\u6392\u5e8f\uff0c\u4e0b\u6b21\u8fd4\u56de\u53e6\u4e00\u4e2a\u6392\u5e8f\u90fd\u4e0d\u7b97\u8fdd\u53cd\u89c4\u8303\u3002\u4f60\u9047\u5230\u7684\u5c31\u662f\u4e09\u4e2a\u8bed\u53e5 PostgreSQL \u5185\u90e8\u5b9e\u73b0\u8fd4\u56de\u4e86\u5b83\u81ea\u8ba4\u4e3a\u65b9\u4fbf\u7684\u987a\u5e8f\u800c\u5df2\u3002\u5177\u4f53\u4e3a\u5565\u53ef\u4ee5\u53bb\u7ffb\u6e90\u7801\uff0c\u4f46\u95ee\u9898\u672c\u8d28\u5c31\u662f\u6211\u8bf4\u7684\u8fd9\u4e2a\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : Vegetable <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6392\u5e8f\u5217\u4e0d\u552f\u4e00\u7684\u60c5\u51b5\u4e0b,\u662f\u4e0d\u4fdd\u8bc1\u6bcf\u6b21\u5f97\u5230\u7684\u987a\u5e8f\u76f8\u540c\u7684.
    \u5e38\u89c1\u7684\u505a\u6cd5\u662f\u4f7f\u7528 id \u4f5c\u4e3a\u7b2c\u4e8c\u4e2a key \u6392\u5e8f.                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : Vegetable <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 *\u552f\u4e00\u8bf4\u7684\u662f distinct                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : imherer <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @reus 
    @bagel 
    @Vegetable 
    \u90a3\u770b\u6765\u662f\u8fd9\u6837\u7684\u4e86\uff0c\u6211\u4ee5\u4e3a\u7684\u7b2c\u4e00\u6761 SQL \u6392\u5e8f\u7684\u7ed3\u679c\uff0c\u540e\u9762\u5206\u9875\u7684\u65f6\u5019\u53ea\u8981\u6392\u5e8f\u5b57\u6bb5\u4e00\u6837\uff0c\u7406\u8bba\u4e0a\u5e94\u8be5\u51fa\u73b0\u548c\u7b2c\u4e00\u6761 SQL \u8bed\u53e5\u4e00\u6837\u7684\u7ed3\u679c\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : imherer <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @allAboutDbmss 
    github.com\/im-here\/pgtest<\/p>\n
    \u4e0d\u77e5\u9053\u80fd\u4e0d\u80fd\u590d\u73b0\u3002<\/p>\n
    \u6211\u6700\u5f00\u59cb\u7684\u64cd\u4f5c\u662f\u63d2\u5165\u4e86 37 \u6761\u6d4b\u8bd5\u6570\u636e\u4e4b\u540e Postico \u91cc\u67e5\u770b\u662f\u6309 id \u987a\u5e8f\u6392\u5217\u7684\uff0c\u7136\u540e\u901a\u8fc7 Postico \u4fee\u6539\u4e86\u90e8\u5206\u6570\u636e\u7684 name\uff0c\u7136\u540e\u987a\u5e8f\u5c31\u4e71\u6389\u4e86\u3002\u8fd9\u65f6\u5019\u67e5\u8be2\u7684\u51fa\u6765\u7684\u6570\u636e\u5c31\u4e0d\u5bf9\u4e86\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : allAboutDbmss <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @imherer \u5982\u4f55\u5bfc\u5165\uff1f\u4f60\u662f\u7528 psql \u547d\u4ee4\u884c COPY \u7684\u5417\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : imherer <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @allAboutDbmss \u6211\u7528\u7684 Postico                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : allAboutDbmss <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @imherer \u6211\u662f linux \u6ca1\u6709\u8fd9\u4e2a Postico\uff0c\u6211\u5c31\u4e0d\u5c1d\u8bd5\u590d\u73b0\u4e86
    \u4e0d\u7ba1\u4f60\u7528\u7684\u662f\u54ea\u4e00\u4e2a\u5177\u4f53\u7684\u6570\u636e\u5e93\uff0cSQL \u4e2d\u5982\u679c\u4f60\u6ca1\u6709\u6307\u5b9a\u987a\u5e8f\uff0c\u8f93\u51fa\u7684\u987a\u5e8f\u662f\u65e0\u6cd5\u7406\u89e3\u7684\u3002
    \u539f\u56e0\u6709\u5f88\u591a:
    – \u5173\u7cfb realtion \u5c31\u662f\u96c6\u5408\uff0c\u96c6\u5408\u662f\u65e0\u5e8f\u7684\u3002\u6570\u636e\u5e93\u5728\u672a\u6307\u5b9a\u987a\u5e8f\u7684\u65f6\u5019\uff0c\u5b83\u4e0d\u4f1a\u82b1\u65f6\u95f4\u53bb\u6392\u5e8f
    – \u5927\u6570\u636e\u96c6\u60c5\u51b5\u4e0b\uff0c\u8f93\u51fa\u53ef\u80fd\u662f\u7528\u5f88\u591a\u7ebf\u7a0b\u5b8c\u6210\u7684\u3002\u6267\u884c\u540c\u4e00\u4e2a SQL \u8bed\u53e5\u524d\u540e\u51e0\u6b21\uff0c\u8f93\u51fa\u53ef\u80fd\u56e0\u4e3a\u591a\u7ebf\u7a0b\u539f\u56e0\u800c\u4e0d\u4e00\u6837<\/p>\n
    \u4f60\u524d\u540e\u51e0\u6761 SQL \u53ea\u662f\u6307\u5b9a\u4e86`recommend`\u7684\u987a\u5e8f\uff0c\u6211\u4eec\u4e0d\u80fd\u51ed\u5b83\u4eec\u7684\u8f93\u51fa\u53bb\u731c\u6d4b id=2 \u5728\u54ea\u91cc\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : index90 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e3b\u7684\u610f\u601d\u662f\uff0c\u8fd9\u4e2a order \u5e76\u4e0d\u662f\u201c\u7a33\u5b9a\u6392\u5e8f\u201d\u3002\u8fd9\u7684\u786e\u6709\u70b9\u5947\u602a\uff0c\u5047\u8bbe recommend \u662f timestamp \u5b57\u6bb5\uff0c\u6211\u6309\u7167\u65f6\u95f4\u6392\u5e8f\uff08\u5f53\u7136\u4f1a\u6709\u91cd\u590d\uff09\uff0c\u7136\u540e\u5206\u9875\u8fd4\u56de\uff0c\u6309\u9053\u7406\u7b2c\u4e00\u9875\u7684\u6570\u636e\u548c\u7b2c\u4e8c\u9875\u7684\u6570\u636e\u5e94\u8be5\u4e0d\u76f8\u540c\u624d\u5bf9\u3002<\/p>\n
    \u53ef\u80fd pg \u9700\u8981\u4f60\u6307\u5b9a\u7b2c\u4e8c\u4e2a\u6392\u5e8f\u952e\u624d\u80fd\u4fdd\u8bc1\u201c\u7a33\u5b9a\u201d\u554a                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : index90 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u641c\u5230\u4e00\u7bc7\u6587\u7ae0\uff0c\u5e0c\u671b\u5e2e\u5230\u4f60\uff1a https:\/\/www.jb51.net\/article\/159126.htm                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : sagaxu <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u7c98\u5305\u5373\u89c6\u611f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : reus <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @index90 \u4f60\u641c “mysql \u5206\u9875 \u91cd\u590d”, “sql server \u5206\u9875 \u91cd\u590d”, “oracle \u5206\u9875 \u91cd\u590d”\uff0c\u90fd\u4f1a\u53d1\u73b0\u540c\u6837\u7684\u884c\u4e3a\u3002\u5bf9 SQL \u6ca1\u6709\u5145\u5206\u7684\u7406\u89e3\uff0c\u5c31\u4f1a\u72af\u8fd9\u4e2a\u9519\u8bef\uff0c\u5e76\u4e0d\u662f pg \u548c\u5176\u4ed6\u6570\u636e\u5e93\u7cfb\u7edf\u6709\u4ec0\u4e48\u4e0d\u540c\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
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