{"id":158923,"date":"2024-11-03T09:56:22","date_gmt":"2024-11-03T01:56:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/158923\/"},"modified":"2024-11-03T09:56:23","modified_gmt":"2024-11-03T01:56:23","slug":"%e4%bd%95%e8%ac%82oracle%e6%a8%99%e6%ba%96%e5%8c%96%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/158923\/","title":{"rendered":"\u4f55\u8b02Oracle\u6a19\u6e96\u5316\uff1f"},"content":{"rendered":"<h1 id=\"%e4%bd%95%e8%ac%82oracle%e6%a8%99%e6%ba%96%e5%8c%96%ef%bc%9f-EuArmJYmme\">\u4f55\u8b02Oracle\u6a19\u6e96\u5316\uff1f<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u7ba1\u7406\u548c\u4f01\u696d\u61c9\u7528\u4e2d\uff0cOracle\u6a19\u6e96\u5316\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\u3002\u5b83\u6d89\u53ca\u5230\u5982\u4f55\u6709\u6548\u5730\u7ba1\u7406\u548c\u7d44\u7e54\u6578\u64da\uff0c\u4ee5\u63d0\u9ad8\u6578\u64da\u7684\u53ef\u7528\u6027\u548c\u4e00\u81f4\u6027\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eOracle\u6a19\u6e96\u5316\u7684\u5b9a\u7fa9\u3001\u91cd\u8981\u6027\u53ca\u5176\u5be6\u65bd\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"oracle%e6%a8%99%e6%ba%96%e5%8c%96%e7%9a%84%e5%ae%9a%e7%be%a9-EuArmJYmme\">Oracle\u6a19\u6e96\u5316\u7684\u5b9a\u7fa9<\/h2>\n<p>Oracle\u6a19\u6e96\u5316\u662f\u6307\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u901a\u904e\u4e00\u7cfb\u5217\u7684\u898f\u5247\u548c\u7a0b\u5e8f\u4f86\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u9019\u4e00\u904e\u7a0b\u901a\u5e38\u5305\u62ec\u6578\u64da\u7684\u6e05\u7406\u3001\u8f49\u63db\u548c\u6574\u5408\uff0c\u4ee5\u6d88\u9664\u5197\u9918\u548c\u4e0d\u4e00\u81f4\u7684\u6578\u64da\u3002\u6a19\u6e96\u5316\u7684\u76ee\u7684\u662f\u70ba\u4e86\u63d0\u9ad8\u6578\u64da\u7684\u8cea\u91cf\uff0c\u5f9e\u800c\u652f\u6301\u66f4\u6e96\u78ba\u7684\u6578\u64da\u5206\u6790\u548c\u6c7a\u7b56\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e6%a8%99%e6%ba%96%e5%8c%96%ef%bc%9f-EuArmJYmme\">\u70ba\u4ec0\u9ebc\u9700\u8981\u6a19\u6e96\u5316\uff1f<\/h2>\n<p>\u5728\u4f01\u696d\u4e2d\uff0c\u6578\u64da\u7684\u8cea\u91cf\u76f4\u63a5\u5f71\u97ff\u5230\u696d\u52d9\u904b\u71df\u7684\u6548\u7387\u548c\u6548\u679c\u3002\u4ee5\u4e0b\u662f\u5e7e\u500b\u6a19\u6e96\u5316\u7684\u91cd\u8981\u6027\uff1a<\/p>\n<ul>\n<li><strong>\u63d0\u9ad8\u6578\u64da\u8cea\u91cf\uff1a<\/strong>\u6a19\u6e96\u5316\u53ef\u4ee5\u6d88\u9664\u91cd\u8907\u6578\u64da\u548c\u4e0d\u4e00\u81f4\u6027\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u6e96\u78ba\u6027\u3002<\/li>\n<li><strong>\u652f\u6301\u6c7a\u7b56\u5236\u5b9a\uff1a<\/strong>\u9ad8\u8cea\u91cf\u7684\u6578\u64da\u80fd\u5920\u652f\u6301\u66f4\u6e96\u78ba\u7684\u696d\u52d9\u5206\u6790\u548c\u6c7a\u7b56\u3002<\/li>\n<li><strong>\u589e\u5f37\u6578\u64da\u6574\u5408\uff1a<\/strong>\u6a19\u6e96\u5316\u4f7f\u5f97\u4f86\u81ea\u4e0d\u540c\u4f86\u6e90\u7684\u6578\u64da\u80fd\u5920\u66f4\u5bb9\u6613\u5730\u6574\u5408\u5728\u4e00\u8d77\uff0c\u5f62\u6210\u4e00\u500b\u7d71\u4e00\u7684\u6578\u64da\u8996\u5716\u3002<\/li>\n<li><strong>\u9075\u5faa\u5408\u898f\u8981\u6c42\uff1a<\/strong>\u8a31\u591a\u884c\u696d\u90fd\u6709\u6578\u64da\u7ba1\u7406\u7684\u5408\u898f\u8981\u6c42\uff0c\u6a19\u6e96\u5316\u6709\u52a9\u65bc\u4f01\u696d\u9075\u5faa\u9019\u4e9b\u898f\u7bc4\u3002<\/li>\n<\/ul>\n<h2 id=\"oracle%e6%a8%99%e6%ba%96%e5%8c%96%e7%9a%84%e5%af%a6%e6%96%bd%e6%96%b9%e6%b3%95-EuArmJYmme\">Oracle\u6a19\u6e96\u5316\u7684\u5be6\u65bd\u65b9\u6cd5<\/h2>\n<p>\u5be6\u65bdOracle\u6a19\u6e96\u5316\u901a\u5e38\u5305\u62ec\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e6%95%b8%e6%93%9a%e6%b8%85%e7%90%86-EuArmJYmme\">1. \u6578\u64da\u6e05\u7406<\/h3>\n<p>\u6578\u64da\u6e05\u7406\u662f\u6a19\u6e96\u5316\u7684\u7b2c\u4e00\u6b65\uff0c\u9019\u4e00\u904e\u7a0b\u5305\u62ec\u8b58\u5225\u548c\u4fee\u6b63\u932f\u8aa4\u6578\u64da\u3002\u53ef\u4ee5\u4f7f\u7528SQL\u67e5\u8a62\u4f86\u67e5\u627e\u91cd\u8907\u7684\u8a18\u9304\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT name, COUNT(*) \nFROM customers \nGROUP BY name \nHAVING COUNT(*) &gt; 1;<\/code><\/pre>\n<h3 id=\"2-%e6%95%b8%e6%93%9a%e8%bd%89%e6%8f%9b-EuArmJYmme\">2. \u6578\u64da\u8f49\u63db<\/h3>\n<p>\u6578\u64da\u8f49\u63db\u6d89\u53ca\u5c07\u6578\u64da\u8f49\u63db\u70ba\u7d71\u4e00\u7684\u683c\u5f0f\u3002\u4f8b\u5982\uff0c\u65e5\u671f\u683c\u5f0f\u53ef\u80fd\u5728\u4e0d\u540c\u7684\u7cfb\u7d71\u4e2d\u6709\u6240\u4e0d\u540c\uff0c\u9019\u6642\u9700\u8981\u5c07\u5176\u8f49\u63db\u70ba\u4e00\u81f4\u7684\u683c\u5f0f\u3002\u53ef\u4ee5\u4f7f\u7528Oracle\u7684TO_DATE\u51fd\u6578\u4f86\u9032\u884c\u65e5\u671f\u8f49\u63db\uff1a<\/p>\n<pre><code>SELECT TO_DATE('2023-10-01', 'YYYY-MM-DD') \nFROM dual;<\/code><\/pre>\n<h3 id=\"3-%e6%95%b8%e6%93%9a%e6%95%b4%e5%90%88-EuArmJYmme\">3. \u6578\u64da\u6574\u5408<\/h3>\n<p>\u6578\u64da\u6574\u5408\u662f\u5c07\u4f86\u81ea\u4e0d\u540c\u4f86\u6e90\u7684\u6578\u64da\u5408\u4f75\u5230\u4e00\u500b\u7d71\u4e00\u7684\u6578\u64da\u5eab\u4e2d\u3002\u9019\u901a\u5e38\u9700\u8981\u4f7f\u7528JOIN\u64cd\u4f5c\u4f86\u9023\u63a5\u4e0d\u540c\u7684\u6578\u64da\u8868\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT a.name, b.order_date \nFROM customers a \nJOIN orders b ON a.id = b.customer_id;<\/code><\/pre>\n<h3 id=\"4-%e6%95%b8%e6%93%9a%e9%a9%97%e8%ad%89-EuArmJYmme\">4. \u6578\u64da\u9a57\u8b49<\/h3>\n<p>\u5728\u6578\u64da\u6a19\u6e96\u5316\u7684\u6700\u5f8c\u4e00\u6b65\uff0c\u9700\u8981\u5c0d\u6578\u64da\u9032\u884c\u9a57\u8b49\uff0c\u4ee5\u78ba\u4fdd\u6240\u6709\u7684\u6578\u64da\u90fd\u7b26\u5408\u9810\u5b9a\u7684\u6a19\u6e96\u3002\u9019\u53ef\u4ee5\u901a\u904e\u7de8\u5beb\u6e2c\u8a66\u7528\u4f8b\u4f86\u5be6\u73fe\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-EuArmJYmme\">\u7d50\u8ad6<\/h2>\n<p>Oracle\u6a19\u6e96\u5316\u662f\u4e00\u500b\u95dc\u9375\u7684\u904e\u7a0b\uff0c\u80fd\u5920\u5e6b\u52a9\u4f01\u696d\u63d0\u9ad8\u6578\u64da\u8cea\u91cf\uff0c\u652f\u6301\u66f4\u6e96\u78ba\u7684\u6c7a\u7b56\u5236\u5b9a\u3002\u901a\u904e\u6578\u64da\u6e05\u7406\u3001\u8f49\u63db\u3001\u6574\u5408\u548c\u9a57\u8b49\uff0c\u4f01\u696d\u53ef\u4ee5\u78ba\u4fdd\u5176\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u662f\u53ef\u9760\u7684\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u6a19\u6e96\u5316\u7684\u91cd\u8981\u6027\u5c07\u6108\u52a0\u51f8\u986f\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u696d\u52d9\u4e2d\u5be6\u65bd\u6709\u6548\u7684\u6578\u64da\u7ba1\u7406\u7b56\u7565\u611f\u8208\u8da3\uff0c\u6216\u8005\u60f3\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u548c<a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a>\u7684\u8cc7\u8a0a\uff0c\u8acb\u96a8\u6642\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u6a19\u6e96\u5316\u7684\u6982\u5ff5\uff0c\u63a2\u7d22\u5176\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u91cd\u8981\u6027\u53ca\u5982\u4f55\u63d0\u5347\u7cfb\u7d71\u6548\u7387\u8207\u4e00\u81f4\u6027\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-158923","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/158923","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=158923"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/158923\/revisions"}],"predecessor-version":[{"id":158924,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/158923\/revisions\/158924"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=158923"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=158923"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=158923"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}