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Question
Nested Case Stmts
I am writing an SQL function:
Returns Table
AS
Return
(
Select X AS Id,
Max(Case When A = N'Apple' Then N'Apple' Else Null End) AS Apple,
Max(Case When B = N'Bat' Then N'Bat' Else Null End) AS Bat
From ....
Where ...
Group By...
)
I want to add an If stmt or another case so that it will determine which Max Case to execute.
For example, conceptually it would look like:
Select X AS Id,
IF Group1 = 'A' then
Max(Case When A = N'Apple' Then N'Apple' Else Null End) AS Apple,
end if
IF Group1 = 'B' then
Max(Case When A = N'Bat' Then N'Bat' Else Null End) AS Bat
end if
From ....
Where ...
Group By...
How can this be done?
Thanks.
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by: angelIIIPosted on 2009-11-05 at 08:30:16ID: 25751135
you have mainly 2 options:
Select X AS Id,
Max( CASE WHEN Group1 = 'A'
THEN CASE When A = N'Apple' Then N'Apple' Else Null End
WHEN Group1 = 'B'
THEN CASE When A = N'Bat' Then N'Bat' Else Null End
END
) AS Apple,
or:
Select X AS Id,
Max( CASE WHEN Group1 = 'A' AND A = N'Apple' Then N'Apple'
WHEN Group1 = 'B' AND A = N'Bat' Then N'Bat'
END
) AS Apple,