{"id":95848,"date":"2024-10-20T04:30:19","date_gmt":"2024-10-19T20:30:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95848\/"},"modified":"2024-10-20T04:30:20","modified_gmt":"2024-10-19T20:30:20","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e5%92%8c%e5%94%af%e4%b8%80%e7%b4%a2%e5%bc%95%e7%9a%84%e5%8d%80%e5%88%a5%e8%a9%b3%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95848\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\u552f\u4e00\u7d04\u675f\u548c\u552f\u4e00\u7d22\u5f15\u7684\u5340\u5225\u8a73\u89e3"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e5%92%8c%e5%94%af%e4%b8%80%e7%b4%a2%e5%bc%95%e7%9a%84%e5%8d%80%e5%88%a5%e8%a9%b3%e8%a7%a3-OuXBgfxJlj\">Oracle\u6578\u64da\u5eab\u552f\u4e00\u7d04\u675f\u548c\u552f\u4e00\u7d22\u5f15\u7684\u5340\u5225\u8a73\u89e3<\/h1>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u552f\u4e00\u7d04\u675f\uff08Unique Constraint\uff09\u548c\u552f\u4e00\u7d22\u5f15\uff08Unique Index\uff09\u90fd\u662f\u7528\u4f86\u78ba\u4fdd\u6578\u64da\u7684\u552f\u4e00\u6027\uff0c\u4f46\u5b83\u5011\u5728\u529f\u80fd\u548c\u4f7f\u7528\u4e0a\u6709\u8457\u660e\u986f\u7684\u5340\u5225\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u5169\u8005\u7684\u5b9a\u7fa9\u3001\u7279\u6027\u53ca\u5176\u4e3b\u8981\u5340\u5225\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5b83\u5011\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%ef%bc%88unique-constraint%ef%bc%89-OuXBgfxJlj\">\u552f\u4e00\u7d04\u675f\uff08Unique Constraint\uff09<\/h2>\n<p>\u552f\u4e00\u7d04\u675f\u662f\u4e00\u7a2e\u6578\u64da\u5b8c\u6574\u6027\u7d04\u675f\uff0c\u7528\u65bc\u78ba\u4fdd\u67d0\u4e00\u5217\u6216\u591a\u5217\u7684\u6578\u64da\u5728\u8868\u4e2d\u662f\u552f\u4e00\u7684\u3002\u9019\u610f\u5473\u8457\u5728\u8a72\u5217\u4e2d\u4e0d\u5141\u8a31\u51fa\u73fe\u91cd\u8907\u7684\u503c\u3002\u552f\u4e00\u7d04\u675f\u53ef\u4ee5\u61c9\u7528\u65bc\u4e00\u500b\u6216\u591a\u500b\u5217\uff0c\u4e26\u4e14\u53ef\u4ee5\u8207\u4e3b\u9375\u7d04\u675f\u4e00\u8d77\u4f7f\u7528\u3002<\/p>\n<h3 id=\"%e7%89%b9%e6%80%a7-OuXBgfxJlj\">\u7279\u6027<\/h3>\n<ul>\n<li>\u552f\u4e00\u7d04\u675f\u53ef\u4ee5\u61c9\u7528\u65bc\u591a\u5217\uff0c\u5f62\u6210\u8907\u5408\u552f\u4e00\u7d04\u675f\u3002<\/li>\n<li>\u7576\u63d2\u5165\u6216\u66f4\u65b0\u6578\u64da\u6642\uff0c\u552f\u4e00\u7d04\u675f\u6703\u81ea\u52d5\u6aa2\u67e5\u6578\u64da\u7684\u552f\u4e00\u6027\u3002<\/li>\n<li>\u552f\u4e00\u7d04\u675f\u5141\u8a31NULL\u503c\uff0c\u4f46\u5728\u540c\u4e00\u5217\u4e2d\u53ea\u80fd\u6709\u4e00\u500bNULL\u503c\u3002<\/li>\n<li>\u552f\u4e00\u7d04\u675f\u6703\u81ea\u52d5\u5275\u5efa\u552f\u4e00\u7d22\u5f15\u4ee5\u652f\u6301\u5176\u529f\u80fd\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-OuXBgfxJlj\">\u793a\u4f8b<\/h3>\n<pre><code>CREATE TABLE employees (\n    employee_id NUMBER PRIMARY KEY,\n    email VARCHAR2(100) UNIQUE,\n    phone_number VARCHAR2(15) UNIQUE\n);<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0cemail\u548cphone_number\u5217\u90fd\u8a2d\u7f6e\u4e86\u552f\u4e00\u7d04\u675f\uff0c\u78ba\u4fdd\u6bcf\u4f4d\u54e1\u5de5\u7684\u96fb\u5b50\u90f5\u4ef6\u548c\u96fb\u8a71\u865f\u78bc\u90fd\u662f\u552f\u4e00\u7684\u3002<\/p>\n<h2 id=\"%e5%94%af%e4%b8%80%e7%b4%a2%e5%bc%95%ef%bc%88unique-index%ef%bc%89-OuXBgfxJlj\">\u552f\u4e00\u7d22\u5f15\uff08Unique Index\uff09<\/h2>\n<p>\u552f\u4e00\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u7528\u65bc\u52a0\u901f\u67e5\u8a62\u4e26\u78ba\u4fdd\u67d0\u4e00\u5217\u6216\u591a\u5217\u7684\u6578\u64da\u552f\u4e00\u6027\u3002\u8207\u552f\u4e00\u7d04\u675f\u4e0d\u540c\uff0c\u552f\u4e00\u7d22\u5f15\u4e3b\u8981\u662f\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u7528\u65bc\u6578\u64da\u5b8c\u6574\u6027\u7d04\u675f\u3002<\/p>\n<h3 id=\"%e7%89%b9%e6%80%a7-OuXBgfxJlj\">\u7279\u6027<\/h3>\n<ul>\n<li>\u552f\u4e00\u7d22\u5f15\u53ef\u4ee5\u7528\u65bc\u4efb\u4f55\u5217\uff0c\u4e0d\u50c5\u9650\u65bc\u7d04\u675f\u7684\u5217\u3002<\/li>\n<li>\u552f\u4e00\u7d22\u5f15\u4e0d\u6703\u81ea\u52d5\u6aa2\u67e5\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9664\u975e\u5b83\u8207\u552f\u4e00\u7d04\u675f\u4e00\u8d77\u4f7f\u7528\u3002<\/li>\n<li>\u552f\u4e00\u7d22\u5f15\u53ef\u4ee5\u5305\u542bNULL\u503c\uff0c\u4e26\u4e14\u53ef\u4ee5\u6709\u591a\u500bNULL\u503c\u3002<\/li>\n<li>\u552f\u4e00\u7d22\u5f15\u53ef\u4ee5\u624b\u52d5\u5275\u5efa\uff0c\u4e26\u4e14\u53ef\u4ee5\u5728\u8868\u5275\u5efa\u5f8c\u6dfb\u52a0\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-OuXBgfxJlj\">\u793a\u4f8b<\/h3>\n<pre><code>CREATE UNIQUE INDEX idx_email ON employees(email);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u624b\u52d5\u5275\u5efa\u4e86\u4e00\u500b\u552f\u4e00\u7d22\u5f15idx_email\uff0c\u9019\u5c07\u78ba\u4fddemail\u5217\u4e2d\u7684\u503c\u662f\u552f\u4e00\u7684\uff0c\u4e26\u4e14\u63d0\u9ad8\u4e86\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%e8%88%87%e5%94%af%e4%b8%80%e7%b4%a2%e5%bc%95%e7%9a%84%e4%b8%bb%e8%a6%81%e5%8d%80%e5%88%a5-OuXBgfxJlj\">\u552f\u4e00\u7d04\u675f\u8207\u552f\u4e00\u7d22\u5f15\u7684\u4e3b\u8981\u5340\u5225<\/h2>\n<table>\n<tr>\n<th id=\"%e7%89%b9%e6%80%a7-OuXBgfxJlj\">\u7279\u6027<\/th>\n<th>\u552f\u4e00\u7d04\u675f<\/th>\n<th>\u552f\u4e00\u7d22\u5f15<\/th>\n<\/tr>\n<tr>\n<td>\u76ee\u7684<\/td>\n<td>\u78ba\u4fdd\u6578\u64da\u7684\u552f\u4e00\u6027<\/td>\n<td>\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd<\/td>\n<\/tr>\n<tr>\n<td>\u81ea\u52d5\u6aa2\u67e5<\/td>\n<td>\u662f<\/td>\n<td>\u5426<\/td>\n<\/tr>\n<tr>\n<td>NULL\u503c\u8655\u7406<\/td>\n<td>\u5141\u8a31\u4e00\u500bNULL<\/td>\n<td>\u5141\u8a31\u591a\u500bNULL<\/td>\n<\/tr>\n<tr>\n<td>\u5275\u5efa\u65b9\u5f0f<\/td>\n<td>\u81ea\u52d5\u5275\u5efa\u7d22\u5f15<\/td>\n<td>\u624b\u52d5\u5275\u5efa<\/td>\n<\/tr>\n<\/table>\n<h2 id=\"%e7%b5%90%e8%ab%96-OuXBgfxJlj\">\u7d50\u8ad6<\/h2>\n<p>\u7e3d\u7d50\u4f86\u8aaa\uff0c\u552f\u4e00\u7d04\u675f\u548c\u552f\u4e00\u7d22\u5f15\u5728Oracle\u6578\u64da\u5eab\u4e2d\u5404\u6709\u5176\u7279\u5b9a\u7684\u7528\u9014\u548c\u7279\u6027\u3002\u552f\u4e00\u7d04\u675f\u4e3b\u8981\u7528\u65bc\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u800c\u552f\u4e00\u7d22\u5f15\u5247\u7528\u65bc\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u6839\u64da\u5177\u9ad4\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u7d04\u675f\u6216\u7d22\u5f15\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u512a\u5316\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u89e3\u6790Oracle\u6578\u64da\u5eab\u4e2d\u552f\u4e00\u7d04\u675f\u8207\u552f\u4e00\u7d22\u5f15\u7684\u5340\u5225\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7406\u89e3\u6578\u64da\u5b8c\u6574\u6027\u8207\u6027\u80fd\u512a\u5316\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-95848","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95848","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=95848"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95848\/revisions"}],"predecessor-version":[{"id":95849,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95848\/revisions\/95849"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95848"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95848"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95848"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}