{"id":60875,"date":"2024-10-13T06:33:17","date_gmt":"2024-10-12T22:33:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60875\/"},"modified":"2024-10-13T06:33:17","modified_gmt":"2024-10-12T22:33:17","slug":"db2%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e8%81%9a%e9%9b%86%e7%9b%ae%e6%a8%99%e8%a1%a8%e7%9a%84%e5%8a%9f%e8%83%bd%e6%98%af%e4%bb%80%e9%ba%bc%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60875\/","title":{"rendered":"DB2\u6578\u64da\u5eab\u4e2d\u805a\u96c6\u76ee\u6a19\u8868\u7684\u529f\u80fd\u662f\u4ec0\u9ebc\uff1f"},"content":{"rendered":"<h1 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id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e8%81%9a%e9%9b%86%e7%9b%ae%e6%a8%99%e8%a1%a8-vytdyITotX\">\u5982\u4f55\u5275\u5efa\u805a\u96c6\u76ee\u6a19\u8868<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u5275\u5efa\u805a\u96c6\u76ee\u6a19\u8868\u7684\u8a9e\u6cd5\u76f8\u5c0d\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u57fa\u672c\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE my_mqt\nAS (SELECT column1, column2, SUM(column3) AS total\n    FROM my_table\n    GROUP BY column1, column2)\nDATA INITIALLY DEFERRED\nREFRESH DEFERRED;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba\u201cmy_mqt\u201d\u7684\u805a\u96c6\u76ee\u6a19\u8868\uff0c\u8a72\u8868\u5b58\u5132\u4e86\u201cmy_table\u201d\u4e2d\u201ccolumn1\u201d\u548c\u201ccolumn2\u201d\u7684\u7d44\u5408\u53ca\u5176\u5c0d\u61c9\u7684\u7e3d\u548c\u3002\u4f7f\u7528\u201cDATA INITIALLY DEFERRED\u201d\u8868\u793a\u6578\u64da\u5728\u5275\u5efa\u6642\u4e0d\u6703\u7acb\u5373\u586b\u5145\uff0c\u800c\u201cREFRESH DEFERRED\u201d\u5247\u8868\u793a\u5728\u6578\u64da\u66f4\u65b0\u6642\u4e0d\u6703\u7acb\u5373\u5237\u65b0\u805a\u96c6\u76ee\u6a19\u8868\u3002<\/p>\n<h2 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href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a>\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>DB2\u6578\u64da\u5eab\u4e2d\u805a\u96c6\u76ee\u6a19\u8868\u7684\u529f\u80fd\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u901a\u904e\u5c07\u76f8\u95dc\u6578\u64da\u7269\u7406\u4e0a\u5b58\u5132\u5728\u4e00\u8d77\u4f86\u512a\u5316\u6578\u64da\u6aa2\u7d22\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-60875","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60875","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=60875"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60875\/revisions"}],"predecessor-version":[{"id":60876,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60875\/revisions\/60876"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60875"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60875"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60875"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}