{"id":143815,"date":"2024-11-01T01:29:21","date_gmt":"2024-10-31T17:29:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143815\/"},"modified":"2024-11-01T01:29:22","modified_gmt":"2024-10-31T17:29:22","slug":"sql-%e5%87%bd%e6%95%b8%e5%8f%96%e5%be%97%e7%b3%bb%e7%b5%b1%e6%97%a5%e6%9c%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143815\/","title":{"rendered":"SQL \u51fd\u6578\u53d6\u5f97\u7cfb\u7d71\u65e5\u671f"},"content":{"rendered":"<h1 id=\"sql-%e5%87%bd%e6%95%b8%e5%8f%96%e5%be%97%e7%b3%bb%e7%b5%b1%e6%97%a5%e6%9c%9f-BAjxLtxSfG\">SQL \u51fd\u6578\u53d6\u5f97\u7cfb\u7d71\u65e5\u671f<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0c\u65e5\u671f\u548c\u6642\u9593\u7684\u8655\u7406\u662f\u975e\u5e38\u91cd\u8981\u7684\u4e00\u74b0\u3002\u7121\u8ad6\u662f\u7528\u65bc\u8a18\u9304\u6578\u64da\u7684\u5275\u5efa\u6642\u9593\u3001\u66f4\u65b0\u6642\u9593\uff0c\u9084\u662f\u7528\u65bc\u67e5\u8a62\u7684\u689d\u4ef6\uff0c\u6b63\u78ba\u5730\u53d6\u5f97\u7cfb\u7d71\u65e5\u671f\u90fd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728 SQL \u4e2d\u5982\u4f55\u4f7f\u7528\u51fd\u6578\u4f86\u53d6\u5f97\u7cfb\u7d71\u65e5\u671f\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"sql-%e4%b8%ad%e7%9a%84%e6%97%a5%e6%9c%9f%e5%87%bd%e6%95%b8-BAjxLtxSfG\">SQL \u4e2d\u7684\u65e5\u671f\u51fd\u6578<\/h2>\n<p>\u4e0d\u540c\u7684\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u63d0\u4f9b\u4e86\u5404\u81ea\u7684\u65e5\u671f\u51fd\u6578\u4f86\u53d6\u5f97\u7cfb\u7d71\u65e5\u671f\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u8cc7\u6599\u5eab\u7cfb\u7d71\u53ca\u5176\u76f8\u61c9\u7684\u65e5\u671f\u51fd\u6578\uff1a<\/p>\n<ul>\n<li><strong>MySQL:<\/strong> \u4f7f\u7528 <code>NOW()<\/code> \u51fd\u6578\u4f86\u53d6\u5f97\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002<\/li>\n<li><strong>SQL Server:<\/strong> \u4f7f\u7528 <code>GETDATE()<\/code> \u51fd\u6578\u4f86\u53d6\u5f97\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002<\/li>\n<li><strong>PostgreSQL:<\/strong> \u4f7f\u7528 <code>CURRENT_TIMESTAMP<\/code> \u6216 <code>NOW()<\/code> \u4f86\u53d6\u5f97\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002<\/li>\n<li><strong>Oracle:<\/strong> \u4f7f\u7528 <code>SYSDATE<\/code> \u4f86\u53d6\u5f97\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002<\/li>\n<\/ul>\n<h2 id=\"mysql-%e4%b8%ad%e7%9a%84%e6%97%a5%e6%9c%9f%e5%87%bd%e6%95%b8%e7%af%84%e4%be%8b-BAjxLtxSfG\">MySQL \u4e2d\u7684\u65e5\u671f\u51fd\u6578\u7bc4\u4f8b<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c<code>NOW()<\/code> \u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u53d6\u5f97\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT NOW() AS CurrentDateTime;<\/code><\/pre>\n<p>\u57f7\u884c\u4e0a\u8ff0\u67e5\u8a62\u5f8c\uff0c\u5c07\u8fd4\u56de\u985e\u4f3c\u65bc <code>2023-10-01 12:34:56<\/code> \u7684\u7d50\u679c\uff0c\u9019\u8868\u793a\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002<\/p>\n<h3 id=\"%e5%83%85%e5%8f%96%e5%be%97%e6%97%a5%e6%9c%9f-BAjxLtxSfG\">\u50c5\u53d6\u5f97\u65e5\u671f<\/h3>\n<p>\u5982\u679c\u53ea\u9700\u8981\u53d6\u5f97\u7576\u524d\u7684\u65e5\u671f\u800c\u4e0d\u9700\u8981\u6642\u9593\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>CURDATE()<\/code> \u51fd\u6578\uff1a<\/p>\n<pre><code>SELECT CURDATE() AS CurrentDate;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u985e\u4f3c\u65bc <code>2023-10-01<\/code> \u7684\u7d50\u679c\u3002<\/p>\n<h2 id=\"sql-server-%e4%b8%ad%e7%9a%84%e6%97%a5%e6%9c%9f%e5%87%bd%e6%95%b8%e7%af%84%e4%be%8b-BAjxLtxSfG\">SQL Server \u4e2d\u7684\u65e5\u671f\u51fd\u6578\u7bc4\u4f8b<\/h2>\n<p>\u5728 SQL Server \u4e2d\uff0c<code>GETDATE()<\/code> \u51fd\u6578\u7528\u65bc\u53d6\u5f97\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002\u4ee5\u4e0b\u662f\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT GETDATE() AS CurrentDateTime;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u985e\u4f3c\u65bc <code>2023-10-01 12:34:56.000<\/code> \u7684\u7d50\u679c\u3002<\/p>\n<h3 id=\"%e5%83%85%e5%8f%96%e5%be%97%e6%97%a5%e6%9c%9f-BAjxLtxSfG\">\u50c5\u53d6\u5f97\u65e5\u671f<\/h3>\n<p>\u82e5\u53ea\u9700\u53d6\u5f97\u65e5\u671f\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>CAST<\/code> \u51fd\u6578\u5c07\u7d50\u679c\u8f49\u63db\u70ba\u65e5\u671f\u683c\u5f0f\uff1a<\/p>\n<pre><code>SELECT CAST(GETDATE() AS DATE) AS CurrentDate;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u985e\u4f3c\u65bc <code>2023-10-01<\/code> \u7684\u7d50\u679c\u3002<\/p>\n<h2 id=\"postgresql-%e4%b8%ad%e7%9a%84%e6%97%a5%e6%9c%9f%e5%87%bd%e6%95%b8%e7%af%84%e4%be%8b-BAjxLtxSfG\">PostgreSQL \u4e2d\u7684\u65e5\u671f\u51fd\u6578\u7bc4\u4f8b<\/h2>\n<p>\u5728 PostgreSQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>CURRENT_TIMESTAMP<\/code> \u6216 <code>NOW()<\/code> \u4f86\u53d6\u5f97\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\uff1a<\/p>\n<pre><code>SELECT CURRENT_TIMESTAMP AS CurrentDateTime;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u985e\u4f3c\u65bc <code>2023-10-01 12:34:56.123456<\/code> \u7684\u7d50\u679c\u3002<\/p>\n<h3 id=\"%e5%83%85%e5%8f%96%e5%be%97%e6%97%a5%e6%9c%9f-BAjxLtxSfG\">\u50c5\u53d6\u5f97\u65e5\u671f<\/h3>\n<p>\u82e5\u53ea\u9700\u53d6\u5f97\u65e5\u671f\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>CURRENT_DATE<\/code>\uff1a<\/p>\n<pre><code>SELECT CURRENT_DATE AS CurrentDate;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u985e\u4f3c\u65bc <code>2023-10-01<\/code> \u7684\u7d50\u679c\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-BAjxLtxSfG\">\u7d50\u8ad6<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u53d6\u5f97\u7cfb\u7d71\u65e5\u671f\u7684\u51fd\u6578\u56e0\u8cc7\u6599\u5eab\u7cfb\u7d71\u800c\u7570\uff0c\u4f46\u5927\u591a\u6578\u7cfb\u7d71\u90fd\u63d0\u4f9b\u4e86\u7c21\u55ae\u6613\u7528\u7684\u51fd\u6578\u4f86\u6eff\u8db3\u9019\u4e00\u9700\u6c42\u3002\u7121\u8ad6\u662f MySQL\u3001SQL Server \u9084\u662f PostgreSQL\uff0c\u958b\u767c\u8005\u90fd\u53ef\u4ee5\u8f15\u9b06\u5730\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\u4f86\u7372\u53d6\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\uff0c\u4e26\u6839\u64da\u9700\u8981\u9032\u884c\u683c\u5f0f\u5316\u3002<\/p>\n<p>\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u548c\u7a69\u5b9a\u6027\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u65b9\u6848\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u7121\u8ad6\u662f\u8cc7\u6599\u5eab\u7ba1\u7406\u9084\u662f\u5176\u4ed6\u61c9\u7528\uff0c<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u63d0\u4f9b\u7684\u89e3\u6c7a\u65b9\u6848\u90fd\u80fd\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4f7f\u7528 SQL \u51fd\u6578\u7372\u53d6\u7cfb\u7d71\u65e5\u671f\uff0c\u7c21\u5316\u6578\u64da\u67e5\u8a62\u548c\u5831\u544a\u904e\u7a0b\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-143815","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143815","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=143815"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143815\/revisions"}],"predecessor-version":[{"id":143816,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143815\/revisions\/143816"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143815"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143815"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143815"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}