{"id":15901,"date":"2023-12-04T23:51:41","date_gmt":"2023-12-04T15:51:41","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=15901"},"modified":"2023-12-04T23:57:14","modified_gmt":"2023-12-04T15:57:14","slug":"oracle-zhong-ru-he-zhi-xian-shi-zhong-fu-shu-ju-hu","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/oracle-zhong-ru-he-zhi-xian-shi-zhong-fu-shu-ju-hu\/","title":{"rendered":"Oracle \u4e2d\u5982\u4f55\u53ea\u663e\u793a\u91cd\u590d\u6570\u636e\uff0c\u6216\u4e0d\u663e\u793a\u91cd\u590d\uff1f"},"content":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>GROUP BY<\/code> \u548c <code>HAVING<\/code> \u5b50\u53e5\u6765\u7b5b\u9009\u53ea\u663e\u793a\u91cd\u590d\u7684\u6570\u636e\uff0c\u6216\u8005\u4f7f\u7528 <code>DISTINCT<\/code> \u5173\u952e\u5b57\u6765\u663e\u793a\u4e0d\u91cd\u590d\u7684\u6570\u636e\u3002<\/p>\n<h3><a id=\"%E6%98%BE%E7%A4%BA%E9%87%8D%E5%A4%8D%E6%95%B0%E6%8D%AE%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u663e\u793a\u91cd\u590d\u6570\u636e\uff1a<\/h3>\n<p>\u901a\u8fc7\u4f7f\u7528 <code>GROUP BY<\/code> \u548c <code>HAVING<\/code> \u5b50\u53e5\uff0c\u4f60\u53ef\u4ee5\u627e\u5230\u5e76\u663e\u793a\u91cd\u590d\u7684\u6570\u636e\u3002<\/p>\n<pre><code class=\"language-sql\">SELECT column1, column2, COUNT(*)\nFROM your_table\nGROUP BY column1, column2\nHAVING COUNT(*) &gt; 1;\n<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u67e5\u8be2\u4e2d\uff0c<code>COUNT(*)<\/code> \u7528\u4e8e\u7edf\u8ba1\u6bcf\u7ec4\u4e2d\u7684\u884c\u6570\uff0c<code>HAVING COUNT(*) &gt; 1<\/code> \u7528\u4e8e\u7b5b\u9009\u51fa\u91cd\u590d\u7684\u6570\u636e\u7ec4\u3002<\/p>\n<h3><a id=\"%E4%B8%8D%E6%98%BE%E7%A4%BA%E9%87%8D%E5%A4%8D%E6%95%B0%E6%8D%AE%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u4e0d\u663e\u793a\u91cd\u590d\u6570\u636e\uff1a<\/h3>\n<p>\u5982\u679c\u4f60\u60f3\u663e\u793a\u4e0d\u91cd\u590d\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>DISTINCT<\/code> \u5173\u952e\u5b57\u3002<\/p>\n<pre><code class=\"language-sql\">SELECT DISTINCT column1, column2\nFROM your_table;\n<\/code><\/pre>\n<p>\u4e0a\u9762\u7684\u67e5\u8be2\u4f1a\u8fd4\u56de\u53bb\u91cd\u540e\u7684\u6570\u636e\uff0c\u786e\u4fdd\u6bcf\u884c\u53ea\u663e\u793a\u4e00\u6b21\u3002<code>DISTINCT<\/code> \u7528\u4e8e\u6d88\u9664\u76f8\u540c\u5217\u503c\u7684\u91cd\u590d\u884c\u3002<\/p>\n<p>\u6839\u636e\u5177\u4f53\u7684\u9700\u6c42\uff0c\u9009\u62e9\u9002\u5408\u7684\u65b9\u6cd5\u3002\u5982\u679c\u9700\u8981\u4e86\u89e3\u91cd\u590d\u6570\u636e\u7684\u51fa\u73b0\u6b21\u6570\u6216\u5177\u4f53\u7684\u91cd\u590d\u884c\uff0c\u4f7f\u7528 <code>GROUP BY<\/code> \u548c <code>HAVING<\/code> \u66f4\u4e3a\u9002\u7528\u3002\u5982\u679c\u53ea\u662f\u60f3\u663e\u793a\u4e0d\u91cd\u590d\u7684\u6570\u636e\uff0c\u4f7f\u7528 <code>DISTINCT<\/code> \u66f4\u4e3a\u7b80\u4fbf\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 GROUP BY \u548c HAVING \u5b50\u53e5\u6765\u7b5b\u9009\u53ea\u663e\u793a\u91cd\u590d\u7684\u6570\u636e\uff0c\u6216\u8005\u4f7f\u7528 DI [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-15901","post","type-post","status-publish","format-standard","hentry","category-oracel"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15901","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=15901"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15901\/revisions"}],"predecessor-version":[{"id":15902,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15901\/revisions\/15902"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=15901"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=15901"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=15901"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}