How to select top (1) max (Data) from dynamic query and set it to variable, to use in another query.

Question

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SQL

Declare @QryMax nvarchar(max)
Declare @RangeFrom VARCHAR(MAX),
Declare @RangeTo VARCHAR(MAX),
Declare @RangeFilter VARCHAR(MAX),
Declare @OneMB int = 1024*1024

SQL

set @QryMax = 'select top (1) MAX( SizePart) Data
            from (
                    select DATEPART('+ @RangeFilter+ ',CreatedOn) as RangeFilter , (FileSize/('+CONVERT (VARCHAR(10), @OneMB)+')) as SizePart from TblAssetDetails
                        where IsDeleted = ''False'' and CreatedOn >= '''+@RangeFrom+''' and CreatedOn <= '''+@RangeTo +'''
                 ) as tbl
            group by RangeFilter'
exec @QryMax

i want to set result of @QryMax (it will be int value) in a variable and

SQL

select * from Get_DataUnit_WithDataDivider(@MaxData)

this function will give in unit in MB, GB, TB and divider, for further data processing.

Posted 27-Sep-15 18:53pm

Santosh K. Tripathi

Updated 27-Sep-15 18:56pm

v2

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jaket-cp · Answer 1 · 2015-09-28T00:08:00

In TSQL, you could try using sp_executesql.

sp_executesql: https://msdn.microsoft.com/en-GB/library/ms188001.aspx[^]

Something like this:

SQL

declare @QryMax nvarchar(max);
declare @SQLString nvarchar(max);
declare @ParmDefinition nvarchar(1000);

set @SQLString = N'select top (1) @QryMax = MAX( SizePart) Data from ...'
set @ParmDefinition = N'@max_OUT int OUTPUT';

exec sp_executesql @SQLString, @ParmDefinition, @max_OUT = @QryMax Output;

select * from Get_DataUnit_WithDataDivider(@QryMax);--note changed from @MaxData in your question

That should help you out, following the link to see how to send in parameters.

Also test to see if your dynamic sql is returning any records, as you may also be having issues with the group by.