在DB2查询中将subselect作为列

Question

我进行了查询，在其中我使用了与原始选择相同的子选择，但条件与原始选择不同，因此无法执行，因为出现此错误：

  

“在有效句中标识的列或表达式无效，SQLCODE = -119，SQLSTATE = 42803，DRIVER = 4.22.36”

如何更正此查询？

SELECT A.COL1, 
       count(A.COL2) AS YYY, 
       sum(A.COL3) AS XXX, 
       (SELECT count(COL1) AS WWW 
        from SCH.TAB01 
        where COL4=A.COL4 
          AND COL5=A.COL5 
          AND COL1=A.COL1 
          AND COL4 = date(days(current date) - 1) 
          AND COL3 > 5 
        GROUP BY COL1) AS OOO 
from SCH.TAB01 as A 
where A.COL4 = date(days(current date) - 1) 
GROUP BY A.COL1

Answer 1

删除子选择中的GROUP BY COL1

顺便说一句，您不需要date(days(current date) - 1)，简单的CURRENT DATE - 1 DAY就足够了。