{"id":153219,"date":"2020-09-08T04:35:59","date_gmt":"2020-09-07T20:35:59","guid":{"rendered":"http:\/\/4563.org\/?p=153219"},"modified":"2020-09-08T04:35:59","modified_gmt":"2020-09-07T20:35:59","slug":"mysql-%e8%bf%99%e7%a7%8d%e6%83%85%e5%86%b5%e6%80%8e%e4%b9%88%e6%9f%a5%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=153219","title":{"rendered":"mysql \u8fd9\u79cd\u60c5\u51b5\u600e\u4e48\u67e5\uff1f"},"content":{"rendered":"
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mysql \u8fd9\u79cd\u60c5\u51b5\u600e\u4e48\u67e5\uff1f <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : qaqLjj <\/span> <\/i> 1<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\"mysql<\/p>\n

\u5982\u56fe\uff0c\u600e\u4e48\u67e5\u8be2\u540c\u65f6\u638c\u63e1\u4e86\u7b2c\u4e00\u5f20\u8868\u6240\u6709\u6280\u80fd\u7684\u5458\u5de5\u5462\uff1f<\/p>\n

\u4e5f\u5c31\u662f\u8bf4\uff0c\u5e0c\u671b\u7684\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n

emp
\u795e\u5d0e
\u76f8\u7530<\/p>\n<\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (8<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : liuxey <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    select distinct emp from EmpSkills t1 where exists (select 1 from Skills t2 where t1.skill = t2.skill);
    \u968f\u624b\u5199\u7684\uff0c\u7a0d\u5fae\u6539\u6539\u5e94\u8be5\u80fd\u7528 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : liuxey <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5443~\uff0c\u53c8\u6ca1\u770b\u6e05\u9898\u76ee\uff1a
    select emp from EmpSkills t1 where exists (select 1 from Skills t2 where t1.skill = t2.skill) group by t1.emp having count(*) > 3
    \u7f3a\u70b9\u662f\u8981\u4e8b\u5148\u77e5\u9053\u4e00\u5171\u6709\u51e0\u4e2a skill \u548c EmpSkills \u8868\u4e0d\u80fd\u7528\u91cd\u590d\u6570\u636e <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : qaqLjj <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @liuxey \u4e0d\u884c\u554a <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : AngryPanda <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4f7f\u7528 group_concat \u66f2\u7ebf\u6551\u56fd\u5e94\u8be5\u53ef\u4ee5\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : jindeq <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e0d\u63a8\u8350 sql \u91cc\u5199\u4e1a\u52a1\u3002
    \u8981\u662f\u771f\u7684\u5199\u53ef\u4ee5\u7528\u5b50\u8868\u3002
    \u5148\u628a\u6280\u80fd\u8868\u6bcf\u4e2a\u6280\u80fd\u6807\u6ce8\u6210 s1,s2 \u7b49
    \u518d\u628a\u7528\u6237\u6280\u80fd\u8868 group by skill, user
    join \u5f97\u5230\u7684\u4e24\u5f20\u8868\uff0con \u7684\u65f6\u5019\u5e26\u4e0a skill \u7684\u6761\u4ef6<\/p>\n

    \u5982\u679c skill \u592a\u591a\uff0c\u8fd9\u6837\u5c31\u4e0d\u73b0\u5b9e\u4e86\uff0c\u63a8\u8350\u4ee3\u7801\u91cc\u5904\u7406 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : qaqLjj <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6628\u5929\u5199\u51fa\u6765\u4e86\uff0c\u5fd8\u8bb0\u5728\u8fd9\u91cc\u66f4\u65b0\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : qaqLjj <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    SELECT DISTINCT emp
    FROM EmpSkills ES1
    WHERE NOT EXISTS
    (
    SELECT skill
    FROM Skills sk
    WHERE NOT EXISTS
    (SELECT skill
    FROM EmpSkills ES2
    WHERE ES1.emp = ES2.emp AND ES2.skill = sk.skill)
    ) <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Aksura <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5982\u679c\u662f 8.0 \u76f4\u63a5\u5206\u6790\u51fd\u6570\u5c31\u53ef\u4ee5\u4e86\u3002\u5982\u679c\u662f 8.0 \u4ee5\u524d\u7684\u7248\u672c\uff0c\u53ef\u4ee5\u8fd9\u6837\uff1a<\/p>\n

    SELECT a.emp
    FROM ( SELECT e.emp
    , COUNT(DISTINCT s.skill) AS cnt
    FROM EmpSkills e
    JOIN Skills s
    ON s.skill = e.skill
    GROUP BY e.emp
    ) a
    JOIN (SELECT COUNT(DISTINCT s.skill) AS cnt
    FROM Skills s
    ) b
    ON b.cnt = a.cnt
    ; <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n","protected":false},"excerpt":{"rendered":"

    mysql \u8fd9\u79cd\u60c5\u51b5\u600e\u4e48\u67e5\uff1f \u8cc7\u6df1…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/153219"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=153219"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/153219\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=153219"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=153219"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=153219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}