{"id":168445,"date":"2024-11-06T12:26:22","date_gmt":"2024-11-06T04:26:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168445\/"},"modified":"2024-11-06T12:26:23","modified_gmt":"2024-11-06T04:26:23","slug":"sql-%e8%aa%9e%e5%8f%a5%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e7%b5%90%e6%a7%8b-%e6%95%b8%e6%93%9a%e5%ba%ab%e9%87%8c%e6%9f%a5%e8%a9%a2%e8%a1%a8%e7%9a%84%e7%b5%90%e6%a7%8b%e7%9a%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168445\/","title":{"rendered":"SQL \u8a9e\u53e5\u67e5\u8a62\u6578\u64da\u5eab\u8868\u7d50\u69cb (\u6578\u64da\u5eab\u91cc\u67e5\u8a62\u8868\u7684\u7d50\u69cb\u7684\u8a9e\u53e5)"},"content":{"rendered":"<h1 id=\"sql-%e8%aa%9e%e5%8f%a5%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e7%b5%90%e6%a7%8b-KDZzuUIFCu\">SQL \u8a9e\u53e5\u67e5\u8a62\u6578\u64da\u5eab\u8868\u7d50\u69cb<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u4e86\u89e3\u8868\u7684\u7d50\u69cb\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u7121\u8ad6\u662f\u9032\u884c\u6578\u64da\u5206\u6790\u3001\u6578\u64da\u9077\u79fb\uff0c\u9084\u662f\u9032\u884c\u7cfb\u7d71\u7dad\u8b77\uff0c\u638c\u63e1\u5982\u4f55\u67e5\u8a62\u6578\u64da\u5eab\u8868\u7684\u7d50\u69cb\u90fd\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u66f4\u6709\u6548\u5730\u5de5\u4f5c\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528 SQL \u8a9e\u53e5\u67e5\u8a62\u6578\u64da\u5eab\u8868\u7684\u7d50\u69cb\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e7%b5%90%e6%a7%8b%ef%bc%9f-KDZzuUIFCu\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u8868\u7d50\u69cb\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u8868\u7d50\u69cb\u662f\u6307\u8868\u4e2d\u5404\u500b\u5b57\u6bb5\u7684\u5b9a\u7fa9\uff0c\u5305\u62ec\u5b57\u6bb5\u540d\u7a31\u3001\u6578\u64da\u985e\u578b\u3001\u7d04\u675f\u689d\u4ef6\u7b49\u3002\u9019\u4e9b\u4fe1\u606f\u5c0d\u65bc\u7406\u89e3\u6578\u64da\u7684\u5b58\u5132\u65b9\u5f0f\u548c\u9032\u884c\u6578\u64da\u64cd\u4f5c\u81f3\u95dc\u91cd\u8981\u3002\u901a\u5e38\uff0c\u6578\u64da\u5eab\u8868\u7d50\u69cb\u53ef\u4ee5\u901a\u904e SQL \u8a9e\u53e5\u4f86\u67e5\u8a62\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e8%a1%a8%e7%b5%90%e6%a7%8b%e7%9a%84-sql-%e8%aa%9e%e5%8f%a5-KDZzuUIFCu\">\u67e5\u8a62\u8868\u7d50\u69cb\u7684 SQL \u8a9e\u53e5<\/h2>\n<p>\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u63d0\u4f9b\u4e86\u4e0d\u540c\u7684\u65b9\u5f0f\u4f86\u67e5\u8a62\u8868\u7684\u7d50\u69cb\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u53ca\u5176\u67e5\u8a62\u8868\u7d50\u69cb\u7684 SQL \u8a9e\u53e5\uff1a<\/p>\n<h3 id=\"1-mysql-KDZzuUIFCu\">1. MySQL<\/h3>\n<p>\u5728 MySQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u67e5\u8a62\u8868\u7684\u7d50\u69cb\uff1a<\/p>\n<pre><code>DESCRIBE \u8868\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u8981\u67e5\u8a62\u540d\u70ba `users` \u7684\u8868\u7684\u7d50\u69cb\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>DESCRIBE users;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u8868\u4e2d\u6240\u6709\u5b57\u6bb5\u7684\u540d\u7a31\u3001\u6578\u64da\u985e\u578b\u3001\u662f\u5426\u53ef\u4ee5\u70ba NULL\u3001\u9375\u985e\u578b\u3001\u9ed8\u8a8d\u503c\u7b49\u4fe1\u606f\u3002<\/p>\n<h3 id=\"2-postgresql-KDZzuUIFCu\">2. PostgreSQL<\/h3>\n<p>\u5728 PostgreSQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u67e5\u8a62\u8868\u7684\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT column_name, data_type, is_nullable, column_default \nFROM information_schema.columns \nWHERE table_name = '\u8868\u540d';<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u67e5\u8a62 `users` \u8868\u7684\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT column_name, data_type, is_nullable, column_default \nFROM information_schema.columns \nWHERE table_name = 'users';<\/code><\/pre>\n<h3 id=\"3-sql-server-KDZzuUIFCu\">3. SQL Server<\/h3>\n<p>\u5728 SQL Server \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u67e5\u8a62\u8868\u7684\u7d50\u69cb\uff1a<\/p>\n<pre><code>EXEC sp_help '\u8868\u540d';<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u67e5\u8a62 `users` \u8868\u7684\u7d50\u69cb\uff1a<\/p>\n<pre><code>EXEC sp_help 'users';<\/code><\/pre>\n<h3 id=\"4-oracle-KDZzuUIFCu\">4. Oracle<\/h3>\n<p>\u5728 Oracle \u6578\u64da\u5eab\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u67e5\u8a62\u8868\u7684\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT column_name, data_type, data_length, nullable \nFROM user_tab_columns \nWHERE table_name = '\u8868\u540d';<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u67e5\u8a62 `users` \u8868\u7684\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT column_name, data_type, data_length, nullable \nFROM user_tab_columns \nWHERE table_name = 'USERS';<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-KDZzuUIFCu\">\u7d50\u8ad6<\/h2>\n<p>\u67e5\u8a62\u6578\u64da\u5eab\u8868\u7684\u7d50\u69cb\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u4e00\u9805\u57fa\u672c\u800c\u91cd\u8981\u7684\u6280\u80fd\u3002\u7121\u8ad6\u4f7f\u7528\u54ea\u7a2e\u6578\u64da\u5eab\u7cfb\u7d71\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u67e5\u8a62\u8868\u7d50\u69cb\u90fd\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u597d\u5730\u7406\u89e3\u6578\u64da\u6a21\u578b\uff0c\u9032\u884c\u6578\u64da\u64cd\u4f5c\u548c\u7dad\u8b77\u3002\u638c\u63e1\u9019\u4e9b SQL \u8a9e\u53e5\u5f8c\uff0c\u60a8\u5c07\u80fd\u5920\u66f4\u8f15\u9b06\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u60a8\u7684\u6578\u64da\u5eab\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4f7f\u7528 SQL \u8a9e\u53e5\u67e5\u8a62\u6578\u64da\u5eab\u8868\u7d50\u69cb\uff0c\u8f15\u9b06\u7372\u53d6\u8868\u7684\u6b04\u4f4d\u3001\u6578\u64da\u985e\u578b\u53ca\u7d04\u675f\u4fe1\u606f\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-168445","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168445","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=168445"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168445\/revisions"}],"predecessor-version":[{"id":168446,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168445\/revisions\/168446"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168445"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168445"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}