SUBSTRING_INDEX精品文章

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  開發(fā)文檔

  ...nd b.bo_machineroom =a.bo_machineroom) LEFT JOIN (SELECT b.bo_arae, substring_index(b.bo_machineroom,/,2 ) as louchen,COUNT(1) as lounum FROM zq_ho_board b where b.bo_camtype=#{camtype} GR...

  張巨偉 2019-08-16 10:41 評(píng)論0 收藏0
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  得到每個(gè)分組里的最大最小記錄 Mongo VS Mysql

  ...1024還不夠用 SET SESSION group_concat_max_len = 20480; select state, substring_index(group_concat(city order by pop ),,,1) smallestCity, min(pop),substring_index(group_concat(city order by pop ),,,-1)...

  gekylin 2019-06-26 17:16 評(píng)論0 收藏0
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  MySQL 查詢in操作，查詢結(jié)果按in集合順序顯示

  MySQL 查詢in操作，查詢結(jié)果按in集合順序顯示 復(fù)制代碼 代碼如下: select * from test where id in(3,1,5) order by find_in_set(id,3,1,5); select * from test where id in(3,1,5) order by substring_index(3,1,2,id,1);

  LancerComet 2019-07-01 12:35 評(píng)論0 收藏0