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我想编写一个查询来分组我的两列基于第三列,并在SQLite中显示结果如下所示CAn任何人指导我如何写这样的结构查询 表结构SQLite查询分组列
CREATE TABLE `Table1` (
`Variable_col` TEXT,
`TimeComes_Col` datetime,
`TimeGoes_Col` datetime)
虚拟数据
Insert Into Table1 Values('var1','2017-03-16 10:00:00',''),('var1','','2017-03-16 10:05:00'),('var1','2017-03-16 10:10:00',''),('var2','2017-03-16 10:15:00','')
到目前为止已经试过,但没有得到结果通缉
WITH RECURSIVE cte1 as(select Variable_Col,TimeComes_Col, (SELECT COUNT()+1 FROM (SELECT DISTINCT TimeComes_Col FROM Table1 AS t WHERE TimeComes_Col < Table1.TimeComes_Col)) as rn from Table1 where TimeComes_Col <> ''),
CTE2如(1 FROM选择TimeGoes_Col,(SELECT COUNT()+(SELECT DISTINCT TimeGoes_Col FROM表1 AS T其中TimeGoes_Col < Table1.TimeGoes_Col) ),如从表1 Rn其中TimeGoes_Col <> '')选择Variable_Col,TimeComes_Col,从CTE1左TimeGoes_Col加入CTE2 b关于a.rn = b.rn
不,它会以随机时间间隔发生 –