dynamic column name at runtime in procedure

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hello there......
i need to create reports in report builder. Sql Query is same for every report but the column name of table changes report to report, For That i created procedure as follows

SQL

alter proc sp_testdynamiccolname
(
    @columnname nvarchar(100),
    @date nvarchar(10)
)
as
begin
declare @query nvarchar(4000)
set @query='Select max('+@columnname+') as maxval,datepart(hour,timestamp) as hour from pointdb where convert(varchar,timestamp,101) in('+Convert(varchar,@date,101)+') group by datepart(hour,timestamp)'

exec(@query)
end

exec sp_testdynamiccolname 'SOLAR_ACTIVE_POWER_G_VAL0','03/07/2014'

but it shows an error:-

Msg 245, Level 16, State 1, Line 1
Conversion failed when converting the varchar value '03/04/2014' to data type int.

plz suggest solution.

Posted 13-Mar-14 19:45pm

TAUSEEF KALDANE

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Andrius Leonavicius · Accepted Answer · 2014-03-14T01:55:00

Hi,

You're definitely missing quotes here. You could use print @query in your stored procedure in order to see how @query looks like. It looks like this:

SQL

Select max(SOLAR_ACTIVE_POWER_G_VAL0) as maxval,datepart(hour,timestamp) as hour from pointdb where convert(varchar,timestamp,101) in(03/07/2014) group by datepart(hour,timestamp)

In order to fix this error, your code near @date should be like this:

SQL

in('''+Convert(varchar,@date,101)+''')

Optional information:
There is another way to write dynamic SQL. It might be useful to you. Please take a look at these links:
1. sp_executesql (Transact-SQL)[^]
2. EXEC and sp_executesql – how are they different?[^]