{"id":96256,"date":"2024-10-20T07:54:17","date_gmt":"2024-10-19T23:54:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96256\/"},"modified":"2024-10-20T07:54:18","modified_gmt":"2024-10-19T23:54:18","slug":"oracle%e4%b8%ad%e7%9a%84%e7%b4%84%e6%9d%9f%e4%b8%ad6%e7%a8%ae%e7%b4%84%e6%9d%9f%e7%9a%84%e4%bb%8b%e7%b4%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96256\/","title":{"rendered":"Oracle\u4e2d\u7684\u7d04\u675f\u4e2d6\u7a2e\u7d04\u675f\u7684\u4ecb\u7d39"},"content":{"rendered":"<h1 id=\"oracle%e4%b8%ad%e7%9a%84%e7%b4%84%e6%9d%9f%e4%b8%ad6%e7%a8%ae%e7%b4%84%e6%9d%9f%e7%9a%84%e4%bb%8b%e7%b4%b9-JkQfbnKdYv\">Oracle\u4e2d\u7684\u7d04\u675f\u4e2d6\u7a2e\u7d04\u675f\u7684\u4ecb\u7d39<\/h1>\n<p>\u5728Oracle\u8cc7\u6599\u5eab\u4e2d\uff0c\u7d04\u675f\uff08Constraint\uff09\u662f\u7528\u4f86\u9650\u5236\u8cc7\u6599\u8868\u4e2d\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u7684\u91cd\u8981\u5de5\u5177\u3002\u900f\u904e\u7d04\u675f\uff0c\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u53ef\u4ee5\u78ba\u4fdd\u8cc7\u6599\u7684\u6b63\u78ba\u6027\uff0c\u907f\u514d\u4e0d\u5408\u898f\u7684\u8cc7\u6599\u9032\u5165\u8cc7\u6599\u5eab\u3002\u672c\u6587\u5c07\u4ecb\u7d39Oracle\u4e2d\u5e38\u898b\u7684\u516d\u7a2e\u7d04\u675f\u985e\u578b\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u7bc4\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\uff0c\u4ee5\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u9019\u4e9b\u7d04\u675f\u7684\u529f\u80fd\u548c\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"1-%e4%b8%bb%e9%8d%b5%e7%b4%84%e6%9d%9f%ef%bc%88primary-key%ef%bc%89-JkQfbnKdYv\">1. \u4e3b\u9375\u7d04\u675f\uff08PRIMARY KEY\uff09<\/h2>\n<p>\u4e3b\u9375\u7d04\u675f\u7528\u65bc\u552f\u4e00\u6a19\u8b58\u8cc7\u6599\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u3002\u6bcf\u500b\u8cc7\u6599\u8868\u53ea\u80fd\u6709\u4e00\u500b\u4e3b\u9375\uff0c\u4e14\u4e3b\u9375\u7684\u503c\u4e0d\u80fd\u70baNULL\u3002\u4e3b\u9375\u901a\u5e38\u7531\u4e00\u500b\u6216\u591a\u500b\u6b04\u4f4d\u7d44\u6210\u3002<\/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<h2 id=\"2-%e5%a4%96%e9%8d%b5%e7%b4%84%e6%9d%9f%ef%bc%88foreign-key%ef%bc%89-JkQfbnKdYv\">2. \u5916\u9375\u7d04\u675f\uff08FOREIGN KEY\uff09<\/h2>\n<p>\u5916\u9375\u7d04\u675f\u7528\u65bc\u5efa\u7acb\u8cc7\u6599\u8868\u4e4b\u9593\u7684\u95dc\u806f\u3002\u5b83\u78ba\u4fdd\u4e00\u500b\u8cc7\u6599\u8868\u4e2d\u7684\u67d0\u500b\u6b04\u4f4d\u7684\u503c\u5fc5\u9808\u5b58\u5728\u65bc\u53e6\u4e00\u500b\u8cc7\u6599\u8868\u7684\u4e3b\u9375\u4e2d\u3002\u9019\u6a23\u53ef\u4ee5\u7dad\u8b77\u8cc7\u6599\u7684\u53c3\u7167\u5b8c\u6574\u6027\u3002<\/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<h2 id=\"3-%e5%94%af%e4%b8%80%e7%b4%84%e6%9d%9f%ef%bc%88unique%ef%bc%89-JkQfbnKdYv\">3. \u552f\u4e00\u7d04\u675f\uff08UNIQUE\uff09<\/h2>\n<p>\u552f\u4e00\u7d04\u675f\u78ba\u4fdd\u8cc7\u6599\u8868\u4e2d\u7684\u67d0\u500b\u6b04\u4f4d\u7684\u503c\u662f\u552f\u4e00\u7684\uff0c\u9019\u610f\u5473\u8457\u8a72\u6b04\u4f4d\u4e0d\u80fd\u6709\u91cd\u8907\u7684\u503c\u3002\u8207\u4e3b\u9375\u4e0d\u540c\u7684\u662f\uff0c\u552f\u4e00\u7d04\u675f\u7684\u6b04\u4f4d\u53ef\u4ee5\u5305\u542bNULL\u503c\u3002<\/p>\n<pre><code>CREATE TABLE users (\n    user_id NUMBER PRIMARY KEY,\n    email VARCHAR2(100) UNIQUE\n);<\/code><\/pre>\n<h2 id=\"4-%e6%aa%a2%e6%9f%a5%e7%b4%84%e6%9d%9f%ef%bc%88check%ef%bc%89-JkQfbnKdYv\">4. \u6aa2\u67e5\u7d04\u675f\uff08CHECK\uff09<\/h2>\n<p>\u6aa2\u67e5\u7d04\u675f\u7528\u65bc\u9650\u5236\u6b04\u4f4d\u7684\u503c\u5fc5\u9808\u6eff\u8db3\u7279\u5b9a\u689d\u4ef6\u3002\u9019\u53ef\u4ee5\u7528\u4f86\u78ba\u4fdd\u8cc7\u6599\u7684\u6709\u6548\u6027\uff0c\u4f8b\u5982\u9650\u5236\u5e74\u9f61\u6b04\u4f4d\u7684\u503c\u5fc5\u9808\u5927\u65bc0\u3002<\/p>\n<pre><code>CREATE TABLE students (\n    student_id NUMBER PRIMARY KEY,\n    age NUMBER CHECK (age &gt; 0)\n);<\/code><\/pre>\n<h2 id=\"5-%e9%9d%9e%e7%a9%ba%e7%b4%84%e6%9d%9f%ef%bc%88not-null%ef%bc%89-JkQfbnKdYv\">5. \u975e\u7a7a\u7d04\u675f\uff08NOT NULL\uff09<\/h2>\n<p>\u975e\u7a7a\u7d04\u675f\u78ba\u4fdd\u67d0\u500b\u6b04\u4f4d\u4e0d\u80fd\u70baNULL\u3002\u9019\u5c0d\u65bc\u90a3\u4e9b\u5fc5\u9808\u6709\u503c\u7684\u6b04\u4f4d\u975e\u5e38\u91cd\u8981\uff0c\u4f8b\u5982\u7528\u6236\u540d\u6216\u5bc6\u78bc\u3002<\/p>\n<pre><code>CREATE TABLE accounts (\n    account_id NUMBER PRIMARY KEY,\n    username VARCHAR2(50) NOT NULL,\n    password VARCHAR2(50) NOT NULL\n);<\/code><\/pre>\n<h2 id=\"6-%e9%bb%98%e8%aa%8d%e7%b4%84%e6%9d%9f%ef%bc%88default%ef%bc%89-JkQfbnKdYv\">6. \u9ed8\u8a8d\u7d04\u675f\uff08DEFAULT\uff09<\/h2>\n<p>\u9ed8\u8a8d\u7d04\u675f\u7528\u65bc\u70ba\u67d0\u500b\u6b04\u4f4d\u6307\u5b9a\u4e00\u500b\u9ed8\u8a8d\u503c\uff0c\u7576\u63d2\u5165\u8cc7\u6599\u6642\u5982\u679c\u8a72\u6b04\u4f4d\u6c92\u6709\u63d0\u4f9b\u503c\uff0c\u5247\u6703\u81ea\u52d5\u4f7f\u7528\u9019\u500b\u9ed8\u8a8d\u503c\u3002<\/p>\n<pre><code>CREATE TABLE orders (\n    order_id NUMBER PRIMARY KEY,\n    order_date DATE DEFAULT SYSDATE\n);<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-JkQfbnKdYv\">\u7e3d\u7d50<\/h2>\n<p>\u5728Oracle\u8cc7\u6599\u5eab\u4e2d\uff0c\u7d04\u675f\u662f\u78ba\u4fdd\u8cc7\u6599\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u7684\u95dc\u9375\u5de5\u5177\u3002\u900f\u904e\u4e3b\u9375\u3001\u5916\u9375\u3001\u552f\u4e00\u3001\u6aa2\u67e5\u3001\u975e\u7a7a\u548c\u9ed8\u8a8d\u7d04\u675f\uff0c\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u8cc7\u6599\u7684\u8cea\u91cf\u548c\u7d50\u69cb\u3002\u4e86\u89e3\u9019\u4e9b\u7d04\u675f\u7684\u4f7f\u7528\u65b9\u6cd5\u5c0d\u65bc\u8a2d\u8a08\u548c\u7dad\u8b77\u8cc7\u6599\u5eab\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u61c9\u7528\u4e2d\u4f7f\u7528\u9019\u4e9b\u7d04\u675f\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u6216\u662f\u9700\u8981\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u63f4\u60a8\u7684\u8cc7\u6599\u5eab\u904b\u884c\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u4e2d\u7684\u516d\u7a2e\u7d04\u675f\uff0c\u5305\u62ec\u4e3b\u9375\u3001\u5916\u9375\u3001\u552f\u4e00\u6027\u3001\u6aa2\u67e5\u3001\u9ed8\u8a8d\u548c\u7d22\u5f15\uff0c\u63d0\u5347\u6578\u64da\u5b8c\u6574\u6027\u8207\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-96256","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96256","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=96256"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96256\/revisions"}],"predecessor-version":[{"id":96257,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96256\/revisions\/96257"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}