{"id":5766,"date":"2021-04-29T13:49:35","date_gmt":"2021-04-29T05:49:35","guid":{"rendered":"https:\/\/www.gbase8.cn\/?p=5766"},"modified":"2021-05-18T10:44:54","modified_gmt":"2021-05-18T02:44:54","slug":"clickhouse-%e5%88%9b%e5%bb%ba%e5%92%8c%e5%88%a0%e9%99%a4%e8%a7%86%e5%9b%be%e7%9a%84%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.gbase8.cn\/en\/5766","title":{"rendered":"Clickhouse \u521b\u5efa\u548c\u5220\u9664\u89c6\u56fe\u7684\u65b9\u6cd5"},"content":{"rendered":"<p>Clickhouse \u901a\u8fc7create MATERIALIZED VIEW \u6765\u521b\u5efa\u7269\u5316\u89c6\u56fe\uff0c\u901a\u8fc7drop view \u6765\u5220\u9664\u89c6\u56fe\u3002\u672c\u6587\u7ed9\u51fa\u4e00\u4e9b\u4f8b\u5b50\u3002<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Directory Navigation<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a2b3d8eb530f\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a2b3d8eb530f\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.gbase8.cn\/en\/5766\/#%E7%89%88%E6%9C%AC\" >\u7248\u672c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.gbase8.cn\/en\/5766\/#%E5%88%9B%E5%BB%BA%E8%A7%86%E5%9B%BE\" >\u521b\u5efa\u89c6\u56fe<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.gbase8.cn\/en\/5766\/#%E5%88%A0%E9%99%A4%E8%A7%86%E5%9B%BE\" >\u5220\u9664\u89c6\u56fe<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%88%E6%9C%AC\"><\/span>\u7248\u672c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u901a\u8fc7\u5982\u4e0b\u547d\u4ee4\uff0c\u67e5\u770bClickhouse\u7684\u7248\u672c\u53f7<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>localhost :) select version();\r\n\r\nSELECT version()\r\n\r\nQuery id: b664382b-e7d2-4f65-8965-59881fbd7ecf\r\n\r\n\u250c\u2500version()\u2500\u2510\r\n\u2502 21.4.5.46 \u2502\r\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\r\n\r\n1 rows in set. Elapsed: 0.019 sec.\r\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%88%9B%E5%BB%BA%E8%A7%86%E5%9B%BE\"><\/span>\u521b\u5efa\u89c6\u56fe<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Clickhouse \u901a\u8fc7create MATERIALIZED VIEW \u6765\u521b\u5efa\u7269\u5316\u89c6\u56fe\uff0c \u5176\u652f\u6301\u5404\u79cd\u6807\u51c6\u7684\u6392\u5e8f\uff0c\u5206\u533a\u7b49\u53c2\u6570\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE MATERIALIZED VIEW IF NOT EXISTS testdb.mv_t2_collectdate\r\nENGINE = SummingMergeTree\r\nPARTITION BY collectdate\r\nORDER BY collectdate AS\r\nSELECT\r\n    collectdate,\r\n    count(*) AS visit\r\nFROM testdb.t2\r\nGROUP BY collectdate\r\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%88%A0%E9%99%A4%E8%A7%86%E5%9B%BE\"><\/span>\u5220\u9664\u89c6\u56fe<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Clickhouse \u901a\u8fc7drop view \u6765\u5220\u9664\u89c6\u56fe\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>localhost :) drop view testdb.mv_t2_collectdate;\r\n\r\nDROP VIEW testdb.mv_t2_collectdate\r\n\r\nQuery id: ee1bc0a5-ba9f-4b6d-b139-e1ace4b7b4fb\r\n\r\nOk.\r\n\r\n0 rows in set. Elapsed: 0.001 sec.\r\n<\/code><\/pre>","protected":false},"excerpt":{"rendered":"<p>Clickhouse \u901a\u8fc7create MATERIALIZED VIEW \u6765\u521b\u5efa\u7269\u5316\u89c6\u56fe\uff0c\u901a\u8fc7drop view \u6765\u5220\u9664\u89c6\u56fe\u3002\u672c\u6587\u7ed9\u51fa\u4e00\u4e9b\u4f8b\u5b50\u3002<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-5766","post","type-post","status-publish","format-standard","hentry","category-clickhouse"],"_links":{"self":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/5766","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/comments?post=5766"}],"version-history":[{"count":1,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/5766\/revisions"}],"predecessor-version":[{"id":5767,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/5766\/revisions\/5767"}],"wp:attachment":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/media?parent=5766"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/categories?post=5766"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/tags?post=5766"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}