Syntax Issues: Sum if in SELECT statement


I need to update Code Block 1. to sum the values of Data.WeekValue if the value is greater than 25 and less than 50.

Code Block 1.
Sum(Data.WeekValue) AS WeekValues

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I'm having troubles with the syntax, I've tried Code Block 2. but not sure how to:
1.  Assign a field name i.e. the AS WeekGreaterThan25
2.  If value isnt in the range I would like the value to be 0 only if no values are in the defined range (don't want to override the sum if the last value isn't in the range defined).

Code Block 2.
Sum(IIF(([Data].[WeekValue] > 25 AND [Data].[WeekValue] <50 ),  AS WeekGreaterThan25

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Try this:
Sum(IIF([Data].[WeekValue] > 25 AND [Data].[WeekValue] <50, [Data].[WeekValue], 0)  AS WeekGreaterThan25
You can also try:
Sum(IIF([Data].[WeekValue] Between 26 AND 49, [Data].[WeekValue], 0) AS WeekGreaterThan25
AndyC1000Author Commented:
When I run the first sum if example there's a syntax error missing operator in expression.
Sorry about that... both those expressions need an extra closing parenthesis.
Sum(IIF([Data].[WeekValue] > 25 AND [Data].[WeekValue] <50, [Data].[WeekValue], 0))  AS WeekGreaterThan25
Sum(IIF([Data].[WeekValue] Between 26 AND 49, [Data].[WeekValue], 0)) AS WeekGreaterThan25

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