{"id":110915,"date":"2020-05-10T21:04:52","date_gmt":"2020-05-10T13:04:52","guid":{"rendered":"http:\/\/4563.org\/?p=110915"},"modified":"2020-05-10T21:04:52","modified_gmt":"2020-05-10T13:04:52","slug":"%e6%95%b0%e6%8d%ae%e5%ba%93%e6%9f%a5%e8%af%a2%e6%97%b6%e4%bd%bf%e7%94%a8-group-by%ef%bc%88%e4%b8%8d%e5%8a%a0-order-by%ef%bc%89%e5%90%8e%e8%bf%94%e5%9b%9e%e7%9a%84%e7%bb%93%e6%9e%9c%e9%bb%98%e8%ae%a4","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=110915","title":{"rendered":"\u6570\u636e\u5e93\u67e5\u8be2\u65f6\u4f7f\u7528 group by\uff08\u4e0d\u52a0 order by\uff09\u540e\u8fd4\u56de\u7684\u7ed3\u679c\u9ed8\u8ba4\u662f\u6309\u600e\u6837\u7684\u89c4\u5219\u6392\u5e8f\u7684\uff1f"},"content":{"rendered":"
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\u6570\u636e\u5e93\u67e5\u8be2\u65f6\u4f7f\u7528 group by\uff08\u4e0d\u52a0 order by\uff09\u540e\u8fd4\u56de\u7684\u7ed3\u679c\u9ed8\u8ba4\u662f\u6309\u600e\u6837\u7684\u89c4\u5219\u6392\u5e8f\u7684\uff1f <\/h1>\n

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\u8cc7\u6df1\u5927\u4f6c : xiri <\/span> <\/i> 51<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
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\u6211\u77e5\u9053\u8981\u8ba9\u8f93\u51fa\u7ed3\u679c\u6709\u5e8f\u52a0\u4e2a order by \u5c31\u884c\uff0c\u4f46\u8fd9\u91cc\u4e0d\u8003\u8651\u8fd9\u4e00\u70b9\uff0c\u5c31\u662f\u5355\u7eaf\u7684\u60f3\u77e5\u9053 group by \u540e\u7684\u8f93\u51fa\u9ed8\u8ba4\u662f\u600e\u4e48\u786e\u5b9a\u987a\u5e8f\u7684\u3002<\/p>\n

\u6211\u8fd9\u91cc\u5728 oracle 11g \u4e0a\u8fdb\u884c\u6d4b\u8bd5\uff0c\u62ff\u5b83\u9ed8\u8ba4\u7684 scott \u7528\u6237\u4e0b\u7684 emp \u8868\u4e3e\u4f8b\uff0c\u8868\u4e2d\u7684 EMPNO \u662f\u4e3b\u952e\u3002<\/p>\n

\u4e0d\u52a0 group by<\/h3>\n

\u76f4\u63a5\u4f7f\u7528select empno,ename from emp;<\/code>,\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff08\u5355\u72ec\u53d6 EMPNO \u6216\u5355\u72ec\u53d6 ENAME \u8f93\u51fa\u7684\u987a\u5e8f\u90fd\u8ddf\u8fd9\u91cc\u662f\u4e00\u6837\u7684\uff0c\u8fd9\u91cc\u628a\u4e24\u5217\u540c\u65f6\u53d6\u51fa\u6765\u65b9\u4fbf\u4e0b\u9762\u7684\u5bf9\u6bd4\uff09\u3002<\/p>\n

     EMPNO ENAME ---------- --------------------       7369 SMITH       7499 ALLEN       7521 WARD       7566 JONES       7654 MARTIN       7698 BLAKE       7782 CLARK       7788 SCOTT       7839 KING       7844 TURNER       7876 ADAMS       EMPNO ENAME ---------- --------------------       7900 JAMES       7902 FORD       7934 MILLER <\/code><\/pre>\n
\u52a0 group by<\/h3>\n
\u4f7f\u7528select ename from emp group by ename;<\/code>\uff08\u867d\u7136\u8fd9\u6837 group by \u6beb\u65e0\u610f\u4e49\uff09\uff0c\u7ed3\u679c\u5982\u4e0b\u3002\u5f88\u660e\u663e\u987a\u5e8f\u6539\u53d8\u4e86\uff0c\u4f46\u662f\u6ca1\u53d1\u73b0\u4efb\u4f55\u89c4\u5f8b\uff0c\u4e0d\u662f\u6309\u5b57\u6bcd\u6392\u7684\uff0c\u8ddf\u4e3b\u952e EMPNO \u4e5f\u6ca1\u6709\u5173\u7cfb<\/p>\n
ENAME -------------------- ALLEN JONES FORD CLARK MILLER SMITH WARD MARTIN SCOTT TURNER ADAMS  ENAME -------------------- BLAKE KING JAMES <\/code><\/pre>\n
\u6bd4\u8f83\u5947\u602a\u7684\u4e00\u70b9\u662f\uff0c\u4f7f\u7528select empno from emp group by empno;<\/code>\u65f6\u7684\u8f93\u51fa\u53c8\u662f\u6709\u5e8f\u7684\uff0c\u662f\u56e0\u4e3a\u7ed3\u679c\u90fd\u662f\u6570\u5b57\uff1f\u8fd8\u662f\u56e0\u4e3a EMPNO \u662f\u4e3b\u952e\uff1f<\/p>\n
     EMPNO ----------       7369       7499       7521       7566       7654       7698       7782       7788       7839       7844       7876       EMPNO ----------       7900       7902       7934 <\/code><\/pre>\n
\u641c\u7d22\u8fc7\u7a0b\u4e2d\u770b\u5230\u8fd9\u6837\u4e00\u53e5\u8bdd\u201c\u6570\u636e\u5e93\u4e2d\u7684\u4e00\u4e2a\u91cd\u8981\u7406\u8bba\u5c31\u662f\u8868\u4e2d\u7684\u8bb0\u5f55\u662f\u6ca1\u6709\u987a\u5e8f\u7684\u3002 \u5982\u679c\u4f60\u4e0d\u5728\u67e5\u8be2\u4e2d\u7528 ORDER BY \u6307\u5b9a\u987a\u5e8f\uff0c\u5219\u7cfb\u7edf\u4f1a\u2018\u968f\u673a\u2019\u7ed9\u51fa\u987a\u5e8f\u201d
 \u53ef\u6211\u611f\u89c9\u5c31\u7b97\u662f\u201c\u968f\u673a\u201d\u4e5f\u8fd8\u662f\u8981\u6709\u4e00\u4e2a\u57fa\u7840\u89c4\u5219\u7684\u5427\uff0c\u6bd5\u7adf\u4e0a\u9762\u7684\u8bed\u53e5\u6bcf\u4e00\u6b21\u67e5\u8be2\u8f93\u51fa\u7684\u7ed3\u679c\u90fd\u662f\u4e00\u6837\u7684\u3002<\/p>\n
\u4e5f\u770b\u5230\u6709\u4eba\u8bf4\u9ed8\u8ba4\u662f\u6309\u4e3b\u952e\u6392\u7684\uff0c\u4f46\u4e0a\u9762\u7684\u7ed3\u679c\u5f88\u660e\u663e\u4e0d\u7b26\u5408\uff0c\u671b\u5927\u4f6c\u89e3\u7b54<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (4<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
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     \u8cc7\u6df1\u5927\u4f6c : catror <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u770b\u770b\u6267\u884c\u8ba1\u5212                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : xiri <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @catror \u5728\u6267\u884c\u8ba1\u5212\u91cc\u627e\u5230\u539f\u56e0\u4e86\uff0c\u8c22\u8c22\u5566
    select empno \u90a3\u4e00\u53e5\u5b9e\u9645\u4e0a\u6267\u884c\u7684\u662f sort group by\uff0c\u800c select ename \u90a3\u4e00\u53e5\u6267\u884c\u7684\u662f hash group by\uff0c\u8fd9\u5e94\u8be5\u7b97\u662f\u6570\u636e\u5e93\u81ea\u5df1\u7684\u4e00\u79cd\u4f18\u5316\u5427                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : msg7086 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6570\u5b57\u5f52\u5e76\u5e94\u8be5\u662f\u76f4\u63a5\u6bd4\u6570\u5b57\u5feb\uff0c\u6240\u4ee5 sort \u540e group\u3002\u6587\u672c\u5f52\u5e76\u7684\u8bdd\u7528\u54c8\u5e0c\u8868\u66f4\u5feb\uff0c\u6254\u8fdb\u6876\u91cc\u518d\u5f52\u5e76\u3002\u6362\u4f60\u81ea\u5df1\u5199\u6570\u636e\u5e93\u7684\u8bdd\u6700\u540e\u5176\u5b9e\u4e5f\u4f1a\u5199\u6210\u8fd9\u6837\u7684\u3002<\/p>\n
    \u81f3\u4e8e\u968f\u673a\u7ed3\u679c\uff0c\u4e3b\u8981\u662f\u6307\u7ed3\u679c\u4e0d\u56fa\u5b9a\u987a\u5e8f\u3002\u5982\u679c\u6570\u636e\u5e93\u9ad8\u5174\uff0c\u4ed6\u53ef\u4ee5\u6309\u7167\u786c\u76d8\u6216\u8005\u5185\u5b58\u4e2d\u5b58\u50a8\u7684\u987a\u5e8f\u6765\u6392\u5e8f\uff0c\u90a3\u4e5f\u662f\u4e00\u79cd\u5f52\u5e76\u7b97\u6cd5\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : guanhui07 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6267\u884c\u8ba1\u5212                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    \u6570\u636e\u5e93\u67e5\u8be2\u65f6\u4f7f\u7528 group by…<\/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\/110915"}],"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=110915"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/110915\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=110915"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=110915"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=110915"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}