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我试图找到4个回报的平均值a,b,c,d。有时候,一个回报前A = 0,我想省略此唯一发现只有A,B的平均,CSQL有一个回报时的平均回报率= 0
SELECT SUM(CASE WHEN x > 0 THEN COALESCE(a, 0) + COALESCE(b, 0) + COALESCE(c, 0) + COALESCE(d, 0))/4
请帮助!
我试图找到4个回报的平均值a,b,c,d。有时候,一个回报前A = 0,我想省略此唯一发现只有A,B的平均,CSQL有一个回报时的平均回报率= 0
SELECT SUM(CASE WHEN x > 0 THEN COALESCE(a, 0) + COALESCE(b, 0) + COALESCE(c, 0) + COALESCE(d, 0))/4
请帮助!
Select Z.PrimaryKeyCol, Avg(Z.Value)
From (
Select PrimaryKeyCol, a As Value
Union All Select PrimaryKeyCol, b
Union All Select PrimaryKeyCol, c
Union All Select PrimaryKeyCol, d
) As Z
Where Z.Value <> 0
Group By Z.PrimaryKeyCol
select (a+b+c+d)
/
(if(a = 0,0,1) + if(b = 0,0,1) + if(c = 0,0,1) + if(d = 0,0,1))
from table