if exists ( exec ( 'select....

I'm trying to write a stored proc, using the execute command as the select statement, but sql parser says 'no way.'

the command is this...

if exists ( exec ( 'select * from poll' + @pollnumber + ' where username = ' + @username ) )

the error is "Incorrect syntax near the keyword 'exec'."

is it even posible to use an execute command in place of the sql select statement with the if exists?
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Gustavo Perez BuenrostroCommented:
EXISTS only permits a subquery not a statement like EXECUTE. To get more detail see "EXISTS (T-SQL)" topic in BOL.

Post more detail about your problem and I'll give you a better advice.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
bsullivan121499Author Commented:

i'm trying to write a stored proc which checks a table for a row with a specific ID.
i've got a LOT of tables in this db that are identical (as far as the columns go).
i figured i'd just make a stored proc which would allow you to specify the table name as one of the input variables.... this way i don't have a stored proc for every single table.

the tables are all named 'poll' + @pollnumber

any idea how i could go through this?
Gustavo Perez BuenrostroCommented:
-- Check next SP:

create proc sp_CheckValue
 @liPollNumber int
,@liUserName varchar(30)
,@btValueExists bit output
  set nocount on
  declare @nvsStatement nvarchar(100)
  set @btValueExists=0

  if object_id('Poll'+cast(@liPollNumber as varchar)) is null return
  set @nvsStatement
     ='select @btValueExists'
     +'=count(username) from Poll'
     +cast(@liPollNumber as varchar)
     +' where username='
  exec sp_executesql
      ,N'@btValueExists bit output'
      ,@btValueExists output

-- You can use the SP shown above as follows:

declare @btExists bit
exec sp_CheckValue 99,'stanley',@btExists output

if @btExists=1
    print 'The users exists'

PD: Let me know if the code works as you need.
bsullivan121499Author Commented:
not quite what i was looking for... but it's really my fault for not explaining more.  this is what i came up with:

create procedure sp_insert_choice ( @pollnumber varchar (7) , @username varchar (50) , @choice int ) as
exec ( 'if exists( select * from poll' + @pollnumber + ' where username = ' + @username + ')' +'
            select 0
            insert into poll' + @pollnumber + '( username , time , choice ) values( ''' + @username + ''' , getdate() , ' + @choice + ')
            select 1'

It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft SQL Server

From novice to tech pro — start learning today.