子查询中的WHERE子句 [英] WHERE clause in sub-query

问题描述

以下SQL查询:

select *  from er_101
 where cd_relnaam IN ( 
     select cd_relnaam 
     from er_101 
     group by cd_relnaam 
     having count(*) > 1)
 AND ld_relopdrachtgever = '1'

尽管我需要该子查询也限制ld_relopdrachtgever = '1'
用HAVING语句怎么可能?

Though I need to have that sub query also limits on ld_relopdrachtgever = '1'
How is that possible with an HAVING statement?

推荐答案

您也可以在子查询中使用WHERE.

You can also use WHERE in sub-query.

SELECT * FROM er_101
 WHERE cd_relnaam IN ( 
     SELECT cd_relnaam 
     FROM er_101 
     WHERE ld_relopdrachtgever = '1'  <--You can add WHERE clause before GROUP BY
   --^^^^^----
     GROUP BY cd_relnaam 
     HAVING COUNT(*) > 1)
 AND ld_relopdrachtgever = '1'

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