Declaring scalar variable for column name

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SQL-Server-2005

, +

SQL

declare @ColumnName varchar
declare @Value varchar

set @ColumnName='Some Column Name'
set @Value='Some value'
select * from Table_Name Where @ColumnName=@Value

I am creating a stored procedure as above. So that I can pass the column name and also value from the code behind.

Before that I made a test:

1. Declared the column name and value
2. Set both Column name and value as in database
3. Selected from table name as above

I am not getting errors but No data is retrieved.

But the column name and value are correct.

Posted 11-Jul-12 0:49am

R. Ganesh Kumar IT

Updated 11-Jul-12 0:51am

AshishChaudha

v2

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3 solutions

Solution 2

Hi Friend....

Please mentioned the size of varchar.

SQL

declare @ColumnName varchar(30)
declare @Value varchar(30)

Posted 11-Jul-12 1:01am

Arul R Ece

Comments

Prasad_Kulkarni 11-Jul-12 7:05am

To the point +5

Solution 3

Both solutions are correct for more you can refer.
Transact-SQL Variables[^] which gives you details of declaring a Transact-SQL Variable

Posted 11-Jul-12 1:05am

Prasad_Kulkarni

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AshishChaudha · Accepted Answer · 2012-07-11T00:56:00

Solution 1

I tried this and working fine..

SQL

declare @ColumnName varchar(20)
declare @Value varchar(20)

set @ColumnName='Some Column Name'
set @Value='Some value'

print @ColumnName
print @Value
select * from Student_mst Where '+ @ColumnName +' = '''+ @Value + '''

declare @query nvarchar(100)
set @query= 'select * from Student_mst Where '+ @ColumnName +' = '''+ @Value + ''''

print @query


--select * from mytablename Where name = 'RWERWRWE'

Thanks

Ashish

mark it answer if it is a solution.

Posted 11-Jul-12 0:56am

AshishChaudha

Updated 11-Jul-12 1:16am

v2

Comments

R. Ganesh Kumar IT 11-Jul-12 7:01am

Hello Ashish I've tried it but still the same

Prasad_Kulkarni 11-Jul-12 7:04am

Yes. A 5!

AshishChaudha 11-Jul-12 7:17am

Thanks prasad

AshishChaudha 11-Jul-12 7:15am

Try this query please

select * from Student_mst Where '+ @ColumnName +' = '''+ @Value + '''

R. Ganesh Kumar IT 11-Jul-12 7:30am

I did that too. Its still the same

I tried by Entering the column name directly with value as scalar variable I got the output.
When I tried entering the value directly and the column name as scalar variable no data is retrieved

R. Ganesh Kumar IT 11-Jul-12 8:25am

Thank you Its working well