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Why does reporting services always fails to update dataset rows?

Posted By:      Posted Date: September 08, 2010    Points: 0   Category :Sql Server
Greetings I am working on a project, i must provide reports via Reporting Services. 2008. Problem is, it is for some reason almost always falsely declaring my query as a bad one (must declare something that IS declared, or wrong use of operator minus when its NOT wrong).  For example, i have a query with parameters @sd and @ed (start date and end date). I intend to let user set @ed to null, in that case, the month of @sd is used. So, first lines of query look like this: IF (@ED IS NULL) BEGIN SET @sd=DATEADD(dd,1-(DAY(@sd)),@sd); SET @ed=DATEADD(dd,-(DAY(DATEADD(mm,1,@sd))),DATEADD(mm,1,@sd)); END   And then it fails to see that @sd is a parameter, instead it spits like 5 times "must declare @sd" and refuses to refresh list of rows. Same happens with other queries. For example, i keep getting the "Operand data type nvarchar is invalid for minus operator" on a 100% correct query. And with others. Those are 100% legit, work in sql management studio as well as they work after i click "continue" at error message and compile a report.   So far this seems like a major bug to me. Or am i doing something wrong?

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