{"id":316325,"date":"2021-02-04T14:12:17","date_gmt":"2021-02-04T06:12:17","guid":{"rendered":"http:\/\/4563.org\/?p=316325"},"modified":"2021-02-04T14:12:17","modified_gmt":"2021-02-04T06:12:17","slug":"sql-%e6%b1%82%e5%8a%a9","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=316325","title":{"rendered":"sql \u6c42\u52a9"},"content":{"rendered":"
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sql \u6c42\u52a9 <\/h1>\n

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\u8cc7\u6df1\u5927\u4f6c : wuwukai007 <\/span> <\/i> 6<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
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\u8fd9\u6761 sql \u662f\u5728\u5199\u4e0d\u51fa\u6765\u4e86 <\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (3<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
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  • \n
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    \u8cc7\u6df1\u5927\u4f6c : saulshao <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6211\u5efa\u8bae\u4f60\u591a\u6b21\u67e5\u8be2\u6570\u636e\u5e93\uff0c\u903b\u8f91\u4e0a\u66f4\u7b80\u5355\u6e05\u695a <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : zlowly <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e0d\u662f\u5f88\u770b\u5f97\u61c2\u4f60\u7684\u4f8b\u5b50\uff0c\u53ea\u80fd\u5927\u6982\u731c\u6d4b\u662f\u4f60\u8fd9\u91cc\u53ef\u80fd\u6d89\u53ca\u5230\u4e00\u4e2a\u884c\u8f6c\u5217\u7684\u67e5\u8be2\u6280\u5de7\uff0c\u5373\u591a\u884c\u7684 sw_class \u8f6c\u6362\u4e3a\u4e24\u5217 sw_\u91c7\u8d2d\uff0csw_\u6d88\u8d39\uff0c\u4e0d\u77e5\u8fd9\u6837\u7406\u89e3\u5bf9\u5426\u3002
    \u901a\u5e38\u8fd9\u79cd\u67e5\u8be2\uff0c\u5982\u679c\u6700\u7ec8\u5217\u6570\u662f\u56fa\u5b9a\u975e\u52a8\u6001\u7684\uff0c\u53ef\u4ee5\u7528\u8fd9\u79cd\u601d\u8def\u8f6c\u6362\uff1a<\/p>\n

    select a,b,c,…sw as sw_\u91c7\u8d2d,0 as sw_\u6d88\u8d39 from t where sw_class=”\u91c7\u8d2d”
    union all
    select a,b,c,…0 as sw_\u91c7\u8d2d,sw as sw_\u6d88\u8d39 from t where sw_class=”\u6d88\u8d39”<\/p>\n

    \u7136\u540e\u5728\u8fd9\u4e2a\u57fa\u7840\u4e0a\u5728\u5916\u5c42\u5305\u88c5\u5206\u7ec4\u7edf\u8ba1\u8fd0\u7b97\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

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    \u8cc7\u6df1\u5927\u4f6c : kmonster <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e00\u4e2a sql \u884c\u8f6c\u5217\uff0c\u4e00\u822c\u8fd9\u79cd\u95ee\u9898\u90fd\u662f\u9762\u8bd5\u7684\u65f6\u5019\u5427\uff1f\u800c\u4e14\u53ea\u6709\u5f88 low \u7684\u516c\u53f8\u8001\u9879\u76ee\u624d\u6709\u8fd9\u79cd\u7c7b\u578b\u7684 SQL \u3002
    \u73b0\u5728\u5199 SQL \u57fa\u672c\u4e0a\u662f\u8d8a\u7b80\u5355\u8d8a\u597d\uff0c\u7136\u540e\u518d\u7528\u4ee3\u7801\u53bb\u505a\u903b\u8f91\u5904\u7406\uff0c\u4e0d\u5efa\u8bae\u8054\u8868\uff0c\u4f1a\u6709\u7b1b\u5361\u5c14\u79ef\u95ee\u9898\u3002
    \u4e00\u822c\u9879\u76ee\u5230\u540e\u9762\u90fd\u662f\u6570\u636e\u5c42\u7684\u538b\u529b\u6bd4\u8f83\u5927\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    sql \u6c42\u52a9 \u8cc7\u6df1\u5927\u4f6c : wuw…<\/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\/316325"}],"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=316325"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/316325\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=316325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=316325"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=316325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}