{"id":7564,"date":"2021-12-31T14:55:47","date_gmt":"2021-12-31T06:55:47","guid":{"rendered":"https:\/\/nj.transwarp.cn:8180\/?p=7564"},"modified":"2022-01-25T15:37:08","modified_gmt":"2022-01-25T07:37:08","slug":"slipstream%e5%8e%bb%e9%87%8d","status":"publish","type":"post","link":"https:\/\/kbwp.transwarp.cn\/?p=7564","title":{"rendered":"slipstream\u53bb\u91cd"},"content":{"rendered":"

\u80cc\u666f<\/h4>\n

\u6d88\u9664\u91cd\u590d\u6570\u636e\u662f\u975e\u5e38\u91cd\u8981\u7684\u529f\u80fd\u3002\u5b9e\u65f6\u8ba1\u7b97\u4e2d\u7684\u53bb\u91cd\u7531\u4e8e\u5b9e\u65f6\u8ba1\u7b97\u7684\u7279\u6027\uff0c\u662f\u4e00\u4e2a\u589e\u91cf\u7684\u957f\u671f\u7684\u8fc7\u7a0b\uff0c\u5e76\u4e14\u7531\u4e8e\u5b9e\u65f6\u6570\u636e\u6d41\u662f\u6709\u72b6\u6001\u7684\uff0c\u6240\u4ee5\u5728\u4e0d\u540c\u7684\u573a\u666f\u4e0b\uff0c\u53bb\u91cd\u7684\u65b9\u6848\u4e5f\u4e0d\u4e00\u6837\u3002<\/p>\n

\n

\u7a97\u53e3\u53bb\u91cd\uff08\u77ed\u65f6\u95f4\u53bb\u91cd\uff09\uff1a<\/h4>\n

\u7a97\u53e3\u53bb\u91cd\u57fa\u4e8egroup by\u7684\u96c6\u5408\u5668\u5185\u53bb\u91cd\uff0c\u8be5\u573a\u666f\u5c06\u7a97\u53e3\u5185\u7684\u6240\u6709key\u5b58\u5165Hashmap\uff0c\u901a\u8fc7Hashmap\u7684key\u7684union\u7279\u6027\u6765\u5b9e\u73b0\u53bb\u91cd\u3002<\/p>\n

\u901a\u8fc7Hashmap\u53bb\u91cd\u7684\u95ee\u9898\u662f\uff0c\u53ea\u80fd\u505a\u5230\u7a97\u53e3\u53bb\u91cd\uff0c\u6ca1\u529e\u6cd5\u57fa\u4e8e\u5168\u91cf\u6570\u636e\u505a\u53bb\u91cd\u3002<\/p>\n

\u4f7f\u7528\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n

select count(distinct id), sum(price) from orders group by product_id;<\/code><\/pre>\n
\n
\u5168\u91cf\u6570\u636e\u6709\u72b6\u6001\u53bb\u91cd\uff08\u957f\u65f6\u95f4\u53bb\u91cd\uff09\uff1a<\/h4>\n
\u76ee\u524d\u65b9\u6848\u662f\u6240\u6709key\u5b58\u5728hbase\uff0c\u901a\u8fc7hbase\u67e5\u8be2\uff08\u6216glk join\uff09\u6765\u5224\u65ad\u662f\u5426\u5b58\u5728\u91cd\u590d\u7684\u6570\u636e\u3002\u8fd9\u79cd\u65b9\u6848\u5f15\u5165\u4e86\u4e2d\u95f4kafka\u4ee5\u53cahbase\uff0c\u5c06\u4e00\u4e2a\u573a\u666f\u62c6\u5206\u6210\u591a\u4e2a\u4efb\u52a1\uff0c\u6574\u4f53\u8f83\u4e3a\u5197\u4f59\u3002<\/p>\n
\u5bf9\u6d41\u5165\u7684\u6570\u636e\u6d41\u8fdb\u884c\u53bb\u91cd\u5f97\u5230\u4e00\u4e2a\u65e0\u91cd\u590d\u6570\u636e\u7684\u6570\u636e\u6d41\uff0c\u7136\u540e\u57fa\u4e8e\u884d\u751f\u6570\u636e\u6d41\u7684\u6765\u8fdb\u884c\u4e0b\u4e00\u6b65\u5904\u7406\u3002<\/p>\n
\u4f7f\u7528\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n
INSERT INTO {target table}\nSELECT *\nFROM {source table}\nDISTINCT BY {source distinct column}\nON {distinct table}.{distinct column};<\/code><\/pre>\n
\n
\u5173\u4e8e\u7a97\u53e3\u51fd\u6570\u4e0edistinct<\/h4>\n
slipstream\u652f\u6301\u7a97\u53e3\u51fd\u6570ROW_NUMBER()\u7684\u67e5\u8be2\uff0c\u4f46\u662f\u5728\u6d41\u4efb\u52a1\u4e2d\u4e0d\u652f\u6301\u3002distinct\u5728\u8001\u7248\u672c\u7684\u4f7f\u7528\u4e0a\u5b58\u5728\u4e00\u4e9bbug\u3002\u5bf9\u4e8e\u6d41\u4e2d\u51fa\u73b0\u7684\u8fd9\u4e24\u79cd\u8bed\u6cd5\uff0c\u9700\u8981\u7279\u522b\u5173\u6ce8\u4e00\u4e0b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u80cc\u666f \u6d88\u9664\u91cd\u590d\u6570\u636e\u662f\u975e\u5e38\u91cd\u8981\u7684\u529f\u80fd\u3002\u5b9e\u65f6\u8ba1\u7b97\u4e2d\u7684\u53bb\u91cd\u7531\u4e8e\u5b9e\u65f6\u8ba1\u7b97\u7684\u7279\u6027\uff0c\u662f\u4e00\u4e2a\u589e\u91cf\u7684\u957f\u671f\u7684\u8fc7\u7a0b\uff0c\u5e76\u4e14\u7531\u4e8e\u5b9e\u65f6\u6570 ..<\/p>\n
<\/div>\n
Read more<\/a><\/p>\n","protected":false},"author":21,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[],"class_list":["post-7564","post","type-post","status-publish","format-standard","hentry","category-configuration"],"acf":[],"_links":{"self":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/7564","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/users\/21"}],"replies":[{"embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7564"}],"version-history":[{"count":1,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/7564\/revisions"}],"predecessor-version":[{"id":7566,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/7564\/revisions\/7566"}],"wp:attachment":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}