{"id":179538,"date":"2024-11-09T02:39:20","date_gmt":"2024-11-08T18:39:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179538\/"},"modified":"2024-11-09T02:39:20","modified_gmt":"2024-11-08T18:39:20","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-sql-%e4%b8%ad%e6%9b%b4%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e9%a1%9e%e5%9e%8b-sql-%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e9%a1%9e","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179538\/","title":{"rendered":"\u5982\u4f55\u5728 SQL \u4e2d\u66f4\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u985e\u578b (sql \u4fee\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u985e\u578b)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8-sql-%e4%b8%ad%e6%9b%b4%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e9%a1%9e%e5%9e%8b-sql-%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e9%a1%9e-oYLHhXgDNO\">\u5982\u4f55\u5728 SQL \u4e2d\u66f4\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u985e\u578b (sql \u4fee\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u985e\u578b)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u96a8\u8457\u696d\u52d9\u9700\u6c42\u7684\u8b8a\u5316\uff0c\u53ef\u80fd\u9700\u8981\u66f4\u6539\u6578\u64da\u5eab\u4e2d\u67d0\u4e9b\u5b57\u6bb5\u7684\u985e\u578b\u3002\u9019\u4e00\u904e\u7a0b\u5728 SQL \u4e2d\u76f8\u5c0d\u7c21\u55ae\uff0c\u4f46\u9700\u8981\u8b39\u614e\u64cd\u4f5c\uff0c\u4ee5\u907f\u514d\u6578\u64da\u4e1f\u5931\u6216\u640d\u58de\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728 SQL \u4e2d\u66f4\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u985e\u578b\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u6ce8\u610f\u4e8b\u9805\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e6%9b%b4%e6%94%b9%e5%ad%97%e6%ae%b5%e9%a1%9e%e5%9e%8b-oYLHhXgDNO\">\u70ba\u4ec0\u9ebc\u9700\u8981\u66f4\u6539\u5b57\u6bb5\u985e\u578b<\/h2>\n<p>\u66f4\u6539\u5b57\u6bb5\u985e\u578b\u7684\u539f\u56e0\u6709\u5f88\u591a\uff0c\u5e38\u898b\u7684\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u696d\u52d9\u9700\u6c42\u8b8a\u66f4\uff1a\u96a8\u8457\u696d\u52d9\u7684\u767c\u5c55\uff0c\u53ef\u80fd\u9700\u8981\u5b58\u5132\u4e0d\u540c\u985e\u578b\u7684\u6578\u64da\u3002<\/li>\n<li>\u6027\u80fd\u512a\u5316\uff1a\u67d0\u4e9b\u6578\u64da\u985e\u578b\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u901a\u904e\u66f4\u6539\u5b57\u6bb5\u985e\u578b\u53ef\u4ee5\u63d0\u9ad8\u6548\u7387\u3002<\/li>\n<li>\u6578\u64da\u4e00\u81f4\u6027\uff1a\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u904e\u7a0b\u4e2d\uff0c\u53ef\u80fd\u6703\u767c\u73fe\u67d0\u4e9b\u5b57\u6bb5\u7684\u985e\u578b\u4e0d\u7b26\u5408\u5be6\u969b\u9700\u6c42\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%9b%b4%e6%94%b9%e5%ad%97%e6%ae%b5%e9%a1%9e%e5%9e%8b%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-oYLHhXgDNO\">\u66f4\u6539\u5b57\u6bb5\u985e\u578b\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u66f4\u6539\u5b57\u6bb5\u985e\u578b\u901a\u5e38\u4f7f\u7528 ALTER TABLE \u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d MODIFY COLUMN \u5217\u540d \u65b0\u6578\u64da\u985e\u578b;<\/code><\/pre>\n<p>\u9019\u88e1\u7684\u201c\u8868\u540d\u201d\u662f\u4f60\u8981\u4fee\u6539\u7684\u8868\u7684\u540d\u7a31\uff0c\u201c\u5217\u540d\u201d\u662f\u4f60\u8981\u66f4\u6539\u7684\u5b57\u6bb5\u540d\u7a31\uff0c\u800c\u201c\u65b0\u6578\u64da\u985e\u578b\u201d\u5247\u662f\u4f60\u5e0c\u671b\u5c07\u8a72\u5b57\u6bb5\u66f4\u6539\u70ba\u7684\u6578\u64da\u985e\u578b\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b-oYLHhXgDNO\">\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>users<\/code> \u7684\u8868\uff0c\u5176\u4e2d\u6709\u4e00\u500b\u540d\u70ba <code>age<\/code> \u7684\u5b57\u6bb5\uff0c\u7576\u524d\u985e\u578b\u70ba <code>INT<\/code>\uff0c\u6211\u5011\u5e0c\u671b\u5c07\u5176\u66f4\u6539\u70ba <code>VARCHAR(3)<\/code>\uff0c\u4ee5\u4fbf\u80fd\u5920\u5b58\u5132\u5e74\u9f61\u7684\u6587\u5b57\u63cf\u8ff0\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE users MODIFY COLUMN age VARCHAR(3);<\/code><\/pre>\n<p>\u9019\u6a23\u5c31\u5c07 <code>age<\/code> \u5b57\u6bb5\u7684\u985e\u578b\u5f9e\u6574\u6578\u66f4\u6539\u70ba\u53ef\u5b58\u5132\u6700\u591a\u4e09\u500b\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-oYLHhXgDNO\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u66f4\u6539\u5b57\u6bb5\u985e\u578b\u6642\uff0c\u6709\u5e7e\u500b\u6ce8\u610f\u4e8b\u9805\u9700\u8981\u8003\u616e\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u517c\u5bb9\u6027\uff1a<\/strong>\u78ba\u4fdd\u65b0\u6578\u64da\u985e\u578b\u80fd\u5920\u517c\u5bb9\u73fe\u6709\u6578\u64da\uff0c\u5426\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e1f\u5931\u6216\u932f\u8aa4\u3002<\/li>\n<li><strong>\u5099\u4efd\u6578\u64da\uff1a<\/strong>\u5728\u9032\u884c\u4efb\u4f55\u7d50\u69cb\u6027\u66f4\u6539\u4e4b\u524d\uff0c\u5efa\u8b70\u5099\u4efd\u6578\u64da\u5eab\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u60c5\u6cc1\u767c\u751f\u3002<\/li>\n<li><strong>\u6e2c\u8a66\u74b0\u5883\uff1a<\/strong>\u5728\u751f\u7522\u74b0\u5883\u4e2d\u9032\u884c\u66f4\u6539\u4e4b\u524d\uff0c\u6700\u597d\u5728\u6e2c\u8a66\u74b0\u5883\u4e2d\u9032\u884c\u9a57\u8b49\uff0c\u4ee5\u78ba\u4fdd\u4e0d\u6703\u5f71\u97ff\u7cfb\u7d71\u7684\u6b63\u5e38\u904b\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-oYLHhXgDNO\">\u7d50\u8ad6<\/h2>\n<p>\u66f4\u6539 SQL \u6578\u64da\u5eab\u5b57\u6bb5\u985e\u578b\u662f\u4e00\u500b\u5e38\u898b\u7684\u64cd\u4f5c\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u6839\u64da\u696d\u52d9\u9700\u6c42\u9032\u884c\u9748\u6d3b\u8abf\u6574\u3002\u901a\u904e\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\uff0c\u60a8\u53ef\u4ee5\u8f15\u9b06\u5730\u4fee\u6539\u5b57\u6bb5\u985e\u578b\uff0c\u4f46\u5728\u9032\u884c\u6b64\u64cd\u4f5c\u6642\uff0c\u52d9\u5fc5\u6ce8\u610f\u6578\u64da\u517c\u5bb9\u6027\u548c\u5099\u4efd\u6578\u64da\u7684\u91cd\u8981\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u5176\u4ed6\u61c9\u7528\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728 SQL \u4e2d\u66f4\u6539\u6578\u64da\u5eab\u5b57\u6bb5\u985e\u578b\uff0c\u638c\u63e1 ALTER TABLE \u8a9e\u53e5\u7684\u4f7f\u7528\uff0c\u8f15\u9b06\u8abf\u6574\u6578\u64da\u7d50\u69cb\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-179538","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179538","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=179538"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179538\/revisions"}],"predecessor-version":[{"id":179539,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179538\/revisions\/179539"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179538"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179538"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}