{"id":95922,"date":"2024-10-20T05:07:15","date_gmt":"2024-10-19T21:07:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95922\/"},"modified":"2024-10-20T05:07:15","modified_gmt":"2024-10-19T21:07:15","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b4%84%e6%9d%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95922\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\u7d04\u675f"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b4%84%e6%9d%9f-WvCCBaIhNk\">Oracle\u6578\u64da\u5eab\u7d04\u675f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u7d04\u675f\uff08Constraints\uff09\u662f\u7528\u4f86\u9650\u5236\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6e96\u78ba\u6027\u7684\u91cd\u8981\u5de5\u5177\u3002Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u7d04\u675f\u985e\u578b\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u6709\u6548\u6027\u548c\u4e00\u81f4\u6027\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eOracle\u6578\u64da\u5eab\u4e2d\u7684\u5404\u7a2e\u7d04\u675f\u985e\u578b\u53ca\u5176\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e7%b4%84%e6%9d%9f%e7%9a%84%e9%a1%9e%e5%9e%8b-WvCCBaIhNk\">\u7d04\u675f\u7684\u985e\u578b<\/h2>\n<p>Oracle\u6578\u64da\u5eab\u652f\u6301\u591a\u7a2e\u7d04\u675f\uff0c\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u5e7e\u7a2e\uff1a<\/p>\n<ul>\n<li><strong>\u4e3b\u9375\u7d04\u675f\uff08PRIMARY KEY\uff09<\/strong><\/li>\n<li><strong>\u5916\u9375\u7d04\u675f\uff08FOREIGN KEY\uff09<\/strong><\/li>\n<li><strong>\u552f\u4e00\u7d04\u675f\uff08UNIQUE\uff09<\/strong><\/li>\n<li><strong>\u6aa2\u67e5\u7d04\u675f\uff08CHECK\uff09<\/strong><\/li>\n<li><strong>\u975e\u7a7a\u7d04\u675f\uff08NOT NULL\uff09<\/strong><\/li>\n<\/ul>\n<h3 id=\"%e4%b8%bb%e9%8d%b5%e7%b4%84%e6%9d%9f-WvCCBaIhNk\">\u4e3b\u9375\u7d04\u675f<\/h3>\n<p>\u4e3b\u9375\u7d04\u675f\u7528\u65bc\u552f\u4e00\u6a19\u8b58\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u6578\u64da\u3002\u6bcf\u500b\u8868\u53ea\u80fd\u6709\u4e00\u500b\u4e3b\u9375\uff0c\u4e14\u4e3b\u9375\u7684\u503c\u4e0d\u80fd\u70ba\u7a7a\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u4e3b\u9375\u7d04\u675f\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE employees (\n    employee_id NUMBER PRIMARY KEY,\n    first_name VARCHAR2(50),\n    last_name VARCHAR2(50)\n);<\/code><\/pre>\n<h3 id=\"%e5%a4%96%e9%8d%b5%e7%b4%84%e6%9d%9f-WvCCBaIhNk\">\u5916\u9375\u7d04\u675f<\/h3>\n<p>\u5916\u9375\u7d04\u675f\u7528\u65bc\u5efa\u7acb\u5169\u500b\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002\u5b83\u78ba\u4fdd\u5916\u9375\u5217\u7684\u503c\u5fc5\u9808\u5728\u53c3\u8003\u8868\u7684\u4e3b\u9375\u5217\u4e2d\u5b58\u5728\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u5916\u9375\u7d04\u675f\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE departments (\n    department_id NUMBER PRIMARY KEY,\n    department_name VARCHAR2(50)\n);\n\nCREATE TABLE employees (\n    employee_id NUMBER PRIMARY KEY,\n    department_id NUMBER,\n    FOREIGN KEY (department_id) REFERENCES departments(department_id)\n);<\/code><\/pre>\n<h3 id=\"%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f-WvCCBaIhNk\">\u552f\u4e00\u7d04\u675f<\/h3>\n<p>\u552f\u4e00\u7d04\u675f\u78ba\u4fdd\u67d0\u4e00\u5217\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u9019\u610f\u5473\u8457\u4e0d\u5141\u8a31\u91cd\u8907\u7684\u6578\u64da\u3002\u6bcf\u500b\u8868\u53ef\u4ee5\u6709\u591a\u500b\u552f\u4e00\u7d04\u675f\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u552f\u4e00\u7d04\u675f\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    user_id NUMBER PRIMARY KEY,\n    email VARCHAR2(100) UNIQUE\n);<\/code><\/pre>\n<h3 id=\"%e6%aa%a2%e6%9f%a5%e7%b4%84%e6%9d%9f-WvCCBaIhNk\">\u6aa2\u67e5\u7d04\u675f<\/h3>\n<p>\u6aa2\u67e5\u7d04\u675f\u7528\u65bc\u9650\u5236\u5217\u4e2d\u7684\u503c\uff0c\u78ba\u4fdd\u5176\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u6aa2\u67e5\u7d04\u675f\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE products (\n    product_id NUMBER PRIMARY KEY,\n    price NUMBER CHECK (price &gt; 0)\n);<\/code><\/pre>\n<h3 id=\"%e9%9d%9e%e7%a9%ba%e7%b4%84%e6%9d%9f-WvCCBaIhNk\">\u975e\u7a7a\u7d04\u675f<\/h3>\n<p>\u975e\u7a7a\u7d04\u675f\u78ba\u4fdd\u67d0\u4e00\u5217\u4e0d\u80fd\u70ba\u7a7a\u3002\u9019\u5c0d\u65bc\u5fc5\u9808\u586b\u5beb\u7684\u5b57\u6bb5\u975e\u5e38\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u975e\u7a7a\u7d04\u675f\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE customers (\n    customer_id NUMBER PRIMARY KEY,\n    name VARCHAR2(100) NOT NULL\n);<\/code><\/pre>\n<h2 id=\"%e7%b4%84%e6%9d%9f%e7%9a%84%e7%ae%a1%e7%90%86-WvCCBaIhNk\">\u7d04\u675f\u7684\u7ba1\u7406<\/h2>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u7d04\u675f\u53ef\u4ee5\u5728\u5275\u5efa\u8868\u6642\u5b9a\u7fa9\uff0c\u4e5f\u53ef\u4ee5\u5728\u8868\u5275\u5efa\u5f8c\u6dfb\u52a0\u6216\u522a\u9664\u3002\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u53ef\u4ee5\u8f15\u9b06\u7ba1\u7406\u7d04\u675f\u3002\u4f8b\u5982\uff0c\u6dfb\u52a0\u4e00\u500b\u6aa2\u67e5\u7d04\u675f\uff1a<\/p>\n<pre><code>ALTER TABLE products\nADD CONSTRAINT check_price CHECK (price &gt; 0);<\/code><\/pre>\n<p>\u8981\u522a\u9664\u7d04\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE products\nDROP CONSTRAINT check_price;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-WvCCBaIhNk\">\u7d50\u8ad6<\/h2>\n<p>Oracle\u6578\u64da\u5eab\u7684\u7d04\u675f\u529f\u80fd\u662f\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u7684\u95dc\u9375\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u4e3b\u9375\u3001\u5916\u9375\u3001\u552f\u4e00\u3001\u6aa2\u67e5\u548c\u975e\u7a7a\u7d04\u675f\uff0c\u6578\u64da\u5eab\u8a2d\u8a08\u8005\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\uff0c\u9632\u6b62\u4e0d\u6b63\u78ba\u6216\u4e0d\u4e00\u81f4\u7684\u6578\u64da\u9032\u5165\u7cfb\u7d71\u3002\u4e86\u89e3\u9019\u4e9b\u7d04\u675f\u7684\u4f7f\u7528\u65b9\u6cd5\u548c\u7ba1\u7406\u6280\u5de7\uff0c\u5c0d\u65bc\u4efb\u4f55\u5e0c\u671b\u5728Oracle\u74b0\u5883\u4e2d\u9032\u884c\u6578\u64da\u5eab\u958b\u767c\u7684\u4eba\u4f86\u8aaa\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc<code><a href=\"https:\/\/server.hk\">VPS<\/a><\/code>\u548c<code><a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a><\/code>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u6578\u64da\u5eab\u7d04\u675f\u7684\u985e\u578b\u53ca\u5176\u5728\u6578\u64da\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u4e2d\u7684\u91cd\u8981\u6027\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\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-95922","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95922","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=95922"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95922\/revisions"}],"predecessor-version":[{"id":95923,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95922\/revisions\/95923"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95922"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95922"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}