{"id":168411,"date":"2024-11-06T12:09:23","date_gmt":"2024-11-06T04:09:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168411\/"},"modified":"2024-11-06T12:09:23","modified_gmt":"2024-11-06T04:09:23","slug":"sql-%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e9%bb%98%e8%aa%8d%e5%80%bc","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168411\/","title":{"rendered":"SQL \u4fee\u6539\u5b57\u6bb5\u9ed8\u8a8d\u503c"},"content":{"rendered":"<h1 id=\"sql-%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e9%bb%98%e8%aa%8d%e5%80%bc-nyxNiONlrX\">SQL \u4fee\u6539\u5b57\u6bb5\u9ed8\u8a8d\u503c<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u64cd\u4f5c\u548c\u67e5\u8a62\u8cc7\u6599\u7684\u6a19\u6e96\u8a9e\u8a00\u3002\u7576\u6211\u5011\u8a2d\u8a08\u8cc7\u6599\u8868\u6642\uff0c\u7d93\u5e38\u9700\u8981\u70ba\u67d0\u4e9b\u5b57\u6bb5\u8a2d\u5b9a\u9ed8\u8a8d\u503c\uff0c\u4ee5\u4fbf\u5728\u63d2\u5165\u65b0\u8a18\u9304\u6642\u81ea\u52d5\u586b\u5145\u9019\u4e9b\u5b57\u6bb5\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728SQL\u4e2d\u4fee\u6539\u5b57\u6bb5\u7684\u9ed8\u8a8d\u503c\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u7bc4\u4f8b\u548c\u6ce8\u610f\u4e8b\u9805\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%bb%98%e8%aa%8d%e5%80%bc%ef%bc%9f-nyxNiONlrX\">\u4ec0\u9ebc\u662f\u9ed8\u8a8d\u503c\uff1f<\/h2>\n<p>\u9ed8\u8a8d\u503c\u662f\u6307\u5728\u63d2\u5165\u65b0\u8a18\u9304\u6642\uff0c\u5982\u679c\u672a\u63d0\u4f9b\u7279\u5b9a\u5b57\u6bb5\u7684\u503c\uff0c\u5247\u81ea\u52d5\u4f7f\u7528\u7684\u503c\u3002\u9019\u5c0d\u65bc\u78ba\u4fdd\u8cc7\u6599\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u975e\u5e38\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u7528\u6236\u8cc7\u6599\u8868\u4e2d\uff0c\u82e5\u6c92\u6709\u63d0\u4f9b\u7528\u6236\u7684\u8a3b\u518a\u65e5\u671f\uff0c\u53ef\u4ee5\u8a2d\u5b9a\u9ed8\u8a8d\u503c\u70ba\u7576\u524d\u65e5\u671f\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e6%94%b9%e5%ad%97%e6%ae%b5%e7%9a%84%e9%bb%98%e8%aa%8d%e5%80%bc-nyxNiONlrX\">\u5982\u4f55\u4fee\u6539\u5b57\u6bb5\u7684\u9ed8\u8a8d\u503c<\/h2>\n<p>\u5728SQL\u4e2d\uff0c\u4fee\u6539\u5b57\u6bb5\u7684\u9ed8\u8a8d\u503c\u901a\u5e38\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d\nMODIFY COLUMN \u5b57\u6bb5\u540d \u6578\u64da\u985e\u578b DEFAULT \u65b0\u9ed8\u8a8d\u503c;<\/code><\/pre>\n<h3 id=\"%e7%af%84%e4%be%8b-nyxNiONlrX\">\u7bc4\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cusers\u201d\u7684\u8cc7\u6599\u8868\uff0c\u5176\u4e2d\u6709\u4e00\u500b\u201cstatus\u201d\u5b57\u6bb5\uff0c\u8a72\u5b57\u6bb5\u7684\u9ed8\u8a8d\u503c\u70ba\u201cactive\u201d\u3002\u5982\u679c\u6211\u5011\u60f3\u5c07\u5176\u9ed8\u8a8d\u503c\u4fee\u6539\u70ba\u201cinactive\u201d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE users\nMODIFY COLUMN status VARCHAR(10) DEFAULT 'inactive';<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u7576\u63d2\u5165\u65b0\u7528\u6236\u6642\uff0c\u5982\u679c\u672a\u6307\u5b9a\u201cstatus\u201d\u5b57\u6bb5\u7684\u503c\uff0c\u5247\u81ea\u52d5\u586b\u5145\u70ba\u201cinactive\u201d\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-nyxNiONlrX\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u985e\u578b\u4e00\u81f4\u6027\uff1a<\/strong>\u5728\u4fee\u6539\u9ed8\u8a8d\u503c\u6642\uff0c\u78ba\u4fdd\u65b0\u9ed8\u8a8d\u503c\u7684\u6578\u64da\u985e\u578b\u8207\u5b57\u6bb5\u7684\u6578\u64da\u985e\u578b\u4e00\u81f4\u3002<\/li>\n<li><strong>\u5f71\u97ff\u73fe\u6709\u6578\u64da\uff1a<\/strong>\u4fee\u6539\u9ed8\u8a8d\u503c\u4e0d\u6703\u5f71\u97ff\u5df2\u5b58\u5728\u7684\u6578\u64da\uff0c\u50c5\u5c0d\u672a\u4f86\u63d2\u5165\u7684\u8a18\u9304\u751f\u6548\u3002<\/li>\n<li><strong>\u8cc7\u6599\u5eab\u7684\u9396\u5b9a\uff1a<\/strong>\u5728\u57f7\u884cALTER TABLE\u64cd\u4f5c\u6642\uff0c\u8cc7\u6599\u5eab\u53ef\u80fd\u6703\u9396\u5b9a\u8a72\u8868\uff0c\u5f71\u97ff\u5176\u4ed6\u64cd\u4f5c\uff0c\u56e0\u6b64\u5efa\u8b70\u5728\u4f4e\u5cf0\u6642\u6bb5\u9032\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-nyxNiONlrX\">\u7d50\u8ad6<\/h2>\n<p>\u4fee\u6539SQL\u5b57\u6bb5\u7684\u9ed8\u8a8d\u503c\u662f\u4e00\u500b\u7c21\u55ae\u4f46\u91cd\u8981\u7684\u64cd\u4f5c\uff0c\u53ef\u4ee5\u5e6b\u52a9\u7dad\u6301\u8cc7\u6599\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u901a\u904e\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\uff0c\u60a8\u53ef\u4ee5\u8f15\u9b06\u5730\u66f4\u65b0\u5b57\u6bb5\u7684\u9ed8\u8a8d\u503c\uff0c\u4ee5\u6eff\u8db3\u696d\u52d9\u9700\u6c42\u3002\u5728\u9032\u884c\u6b64\u985e\u64cd\u4f5c\u6642\uff0c\u8acb\u52d9\u5fc5\u8003\u616e\u6578\u64da\u985e\u578b\u7684\u4e00\u81f4\u6027\u548c\u5c0d\u73fe\u6709\u6578\u64da\u7684\u5f71\u97ff\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3\u6709\u95dc\u8cc7\u6599\u5eab\u7ba1\u7406\u548c\u5176\u4ed6\u6280\u8853\u4e3b\u984c\u7684\u4fe1\u606f\uff0c\u60a8\u53ef\u4ee5\u8a2a\u554f<a href=\"https:\/\/server.hk\">Server.HK<\/a>\uff0c\u6211\u5011\u63d0\u4f9b\u5404\u7a2e<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u548c<a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a>\u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728SQL\u4e2d\u4fee\u6539\u5b57\u6bb5\u7684\u9ed8\u8ba4\u503c\uff0c\u786e\u4fdd\u6570\u636e\u4e00\u81f4\u6027\u548c\u6709\u6548\u6027\uff0c\u63d0\u5347\u6570\u636e\u5e93\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-168411","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168411","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=168411"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168411\/revisions"}],"predecessor-version":[{"id":168412,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168411\/revisions\/168412"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168411"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168411"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}