{"id":160503,"date":"2024-11-03T22:38:23","date_gmt":"2024-11-03T14:38:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160503\/"},"modified":"2024-11-03T22:38:24","modified_gmt":"2024-11-03T14:38:24","slug":"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160503\/","title":{"rendered":"OceanBase \u6559\u7a0b\uff1aOceanBase \u51fd\u6578\u6982\u8ff0"},"content":{"rendered":"<h1 id=\"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-PUXhsUWHiQ\">OceanBase \u6559\u7a0b\uff1aOceanBase \u51fd\u6578\u6982\u8ff0<\/h1>\n<p>OceanBase \u662f\u4e00\u6b3e\u7531\u963f\u91cc\u5df4\u5df4\u958b\u767c\u7684\u5206\u4f48\u5f0f\u95dc\u806f\u6578\u64da\u5eab\uff0c\u65e8\u5728\u63d0\u4f9b\u9ad8\u53ef\u7528\u6027\u548c\u9ad8\u64f4\u5c55\u6027\u7684\u6578\u64da\u5b58\u5132\u89e3\u6c7a\u65b9\u6848\u3002\u96a8\u8457\u5927\u6578\u64da\u548c\u96f2\u8a08\u7b97\u7684\u8208\u8d77\uff0cOceanBase \u5728\u696d\u754c\u9010\u6f38\u53d7\u5230\u91cd\u8996\u3002\u672c\u6587\u5c07\u5c0d OceanBase \u7684\u51fd\u6578\u9032\u884c\u6982\u8ff0\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5176\u529f\u80fd\u548c\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-oceanbase-%e5%87%bd%e6%95%b8%ef%bc%9f-PUXhsUWHiQ\">\u4ec0\u9ebc\u662f OceanBase \u51fd\u6578\uff1f<\/h2>\n<p>\u5728 OceanBase \u4e2d\uff0c\u51fd\u6578\u662f\u7528\u4f86\u57f7\u884c\u7279\u5b9a\u64cd\u4f5c\u7684\u4ee3\u78bc\u584a\u3002\u9019\u4e9b\u64cd\u4f5c\u53ef\u4ee5\u662f\u6578\u64da\u8655\u7406\u3001\u8a08\u7b97\u6216\u662f\u6578\u64da\u8f49\u63db\u7b49\u3002OceanBase \u63d0\u4f9b\u4e86\u591a\u7a2e\u5167\u5efa\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u5728 SQL \u67e5\u8a62\u4e2d\u76f4\u63a5\u4f7f\u7528\uff0c\u5f9e\u800c\u63d0\u9ad8\u958b\u767c\u6548\u7387\u3002<\/p>\n<h2 id=\"oceanbase-%e5%85%a7%e5%bb%ba%e5%87%bd%e6%95%b8%e9%a1%9e%e5%9e%8b-PUXhsUWHiQ\">OceanBase \u5167\u5efa\u51fd\u6578\u985e\u578b<\/h2>\n<p>OceanBase \u7684\u5167\u5efa\u51fd\u6578\u4e3b\u8981\u53ef\u4ee5\u5206\u70ba\u4ee5\u4e0b\u5e7e\u985e\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u5b78\u51fd\u6578\uff1a<\/strong>\u7528\u65bc\u57f7\u884c\u6578\u5b78\u8a08\u7b97\u7684\u51fd\u6578\uff0c\u4f8b\u5982 <code>ABS()<\/code>\u3001<code>ROUND()<\/code> \u548c <code>FLOOR()<\/code>\u3002<\/li>\n<li><strong>\u5b57\u7b26\u4e32\u51fd\u6578\uff1a<\/strong>\u7528\u65bc\u8655\u7406\u5b57\u7b26\u4e32\u7684\u51fd\u6578\uff0c\u4f8b\u5982 <code>CONCAT()<\/code>\u3001<code>SUBSTRING()<\/code> \u548c <code>LENGTH()<\/code>\u3002<\/li>\n<li><strong>\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\uff1a<\/strong>\u7528\u65bc\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\u7684\u51fd\u6578\uff0c\u4f8b\u5982 <code>NOW()<\/code>\u3001<code>DATE_ADD()<\/code> \u548c <code>DATEDIFF()<\/code>\u3002<\/li>\n<li><strong>\u805a\u5408\u51fd\u6578\uff1a<\/strong>\u7528\u65bc\u5c0d\u6578\u64da\u9032\u884c\u805a\u5408\u8a08\u7b97\u7684\u51fd\u6578\uff0c\u4f8b\u5982 <code>SUM()<\/code>\u3001<code>AVG()<\/code> \u548c <code>COUNT()<\/code>\u3002<\/li>\n<li><strong>\u689d\u4ef6\u51fd\u6578\uff1a<\/strong>\u7528\u65bc\u6839\u64da\u689d\u4ef6\u8fd4\u56de\u4e0d\u540c\u7d50\u679c\u7684\u51fd\u6578\uff0c\u4f8b\u5982 <code>IF()<\/code> \u548c <code>CASE<\/code>\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%b8%b8%e7%94%a8-oceanbase-%e5%87%bd%e6%95%b8%e7%a4%ba%e4%be%8b-PUXhsUWHiQ\">\u5e38\u7528 OceanBase \u51fd\u6578\u793a\u4f8b<\/h2>\n<h3 id=\"%e6%95%b8%e5%ad%b8%e5%87%bd%e6%95%b8%e7%a4%ba%e4%be%8b-PUXhsUWHiQ\">\u6578\u5b78\u51fd\u6578\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT ABS(-10) AS absolute_value;  -- \u8fd4\u56de 10\nSELECT ROUND(3.14159, 2) AS rounded_value;  -- \u8fd4\u56de 3.14\n<\/code><\/pre>\n<h3 id=\"%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b8%e7%a4%ba%e4%be%8b-PUXhsUWHiQ\">\u5b57\u7b26\u4e32\u51fd\u6578\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT CONCAT('Hello', ' ', 'World') AS greeting;  -- \u8fd4\u56de 'Hello World'\nSELECT SUBSTRING('OceanBase', 1, 5) AS substring;  -- \u8fd4\u56de 'Ocean'\n<\/code><\/pre>\n<h3 id=\"%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8%e7%a4%ba%e4%be%8b-PUXhsUWHiQ\">\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT NOW() AS current_time;  -- \u8fd4\u56de\u7576\u524d\u6642\u9593\nSELECT DATE_ADD(NOW(), INTERVAL 1 DAY) AS tomorrow;  -- \u8fd4\u56de\u660e\u5929\u7684\u65e5\u671f\n<\/code><\/pre>\n<h3 id=\"%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8%e7%a4%ba%e4%be%8b-PUXhsUWHiQ\">\u805a\u5408\u51fd\u6578\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT COUNT(*) AS total_records FROM users;  -- \u8fd4\u56de\u7528\u6236\u8868\u4e2d\u7684\u8a18\u9304\u7e3d\u6578\nSELECT AVG(salary) AS average_salary FROM employees;  -- \u8fd4\u56de\u54e1\u5de5\u7684\u5e73\u5747\u85aa\u8cc7\n<\/code><\/pre>\n<h3 id=\"%e6%a2%9d%e4%bb%b6%e5%87%bd%e6%95%b8%e7%a4%ba%e4%be%8b-PUXhsUWHiQ\">\u689d\u4ef6\u51fd\u6578\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT IF(age &gt; 18, 'Adult', 'Minor') AS age_group FROM persons;  -- \u6839\u64da\u5e74\u9f61\u8fd4\u56de\u6210\u4eba\u6216\u672a\u6210\u5e74\u4eba\n<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-PUXhsUWHiQ\">\u7d50\u8ad6<\/h2>\n<p>OceanBase \u63d0\u4f9b\u4e86\u591a\u7a2e\u5f37\u5927\u7684\u5167\u5efa\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5728\u6578\u64da\u8655\u7406\u548c\u67e5\u8a62\u4e2d\u63d0\u9ad8\u6548\u7387\u3002\u7121\u8ad6\u662f\u6578\u5b78\u8a08\u7b97\u3001\u5b57\u7b26\u4e32\u8655\u7406\u9084\u662f\u65e5\u671f\u6642\u9593\u64cd\u4f5c\uff0cOceanBase \u90fd\u80fd\u63d0\u4f9b\u76f8\u61c9\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u4e86\u89e3\u9019\u4e9b\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u5c07\u6709\u52a9\u65bc\u958b\u767c\u8005\u66f4\u597d\u5730\u5229\u7528 OceanBase \u7684\u529f\u80fd\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3 OceanBase \u6216\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 OceanBase \u51fd\u6578\u7684\u57fa\u672c\u6982\u5ff5\u8207\u61c9\u7528\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u5229\u7528 OceanBase \u6578\u64da\u5eab\u9032\u884c\u9ad8\u6548\u6578\u64da\u8655\u7406\u8207\u7ba1\u7406\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-160503","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160503","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=160503"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160503\/revisions"}],"predecessor-version":[{"id":160504,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160503\/revisions\/160504"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}