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SSRS can display data in Preview, but it is fail to display data in report, what to do?

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Hi Guys,

my report works fine in "Preview" and data can be present. But in report data is blank(Table can be present with column name).  Below is my SQL query and i just paste the script into Dataset. and bound the table with the dataset. Do you know how to fix the issue?

declare @TotalSum int;

 

set @TotalSum=

(

select sum(DB1.[DB1_Estimate])

from DB1

right outer join [dbo].[DB2]

on DB1.ID=[DB2].ID

)

 

select

QueryData.[ Category] as [Category],

QueryData.EstimateTime as EstimateTime,

convert(float,Round(QueryData.EstimateTime*100.0/@TotalSum,2)) as Percentage,

@TotalSum as Total

from

(

select [DB2].[Category],ISNULL(sum(DB1.[DB1_Estimate]),0) as EstimateTime

from DB1

right outer join [dbo].[DB2]

on DB1.ID=[DB2].ID

group by [DB2]. [Category]

) as QueryData

order by QueryData.EstimateTime ASC


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