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My Variable in sql statement

Author

Topic

pamyral_279
Posting Yak Master

143 Posts

Posted - 2006-08-11 : 02:58:43

Declare @MyCode nvarchar(20);
Set @MyCode='ABC'
set @int_rowcount=(SELECT count(hoten) FROM @MyCode)
I run it but still errors !
How can i implement above statement ?
Thank you very much !

khtan
In (Som, Ni, Yak)

17689 Posts

Posted - 2006-08-11 : 03:01:15

you can't use a variable for table name
if you need to you have to use Dynamic SQL like exec() or sp_executesql. Check out the detail in Books On Line

pamyral_279
Posting Yak Master

143 Posts

Posted - 2006-08-11 : 04:00:44

I need to run "select count(*) from table" and get the result.
And then assign result of above statement into variable !
My problem : Table in above statement is variable.
how can i write sql ?
Thank you very much.

quote:
Originally posted by khtan

you can't use a variable for table name
if you need to you have to use Dynamic SQL like exec() or sp_executesql. Check out the detail in Books On Line

KH

khtan
In (Som, Ni, Yak)

17689 Posts

Posted - 2006-08-11 : 04:03:13

then you have to use sp_exeuctesql

try this


declare @sql nvarchar(4000)
select @sql = N'select @int_rowcount = count(hoten) from ' + @MyCode
exec sp_executesql @sql, N'@int_rowcount int OUTPUT', @int_rowcount OUTPUT

EDIT : Typo error in red

pamyral_279
Posting Yak Master

143 Posts

Posted - 2006-08-11 : 04:27:25

Sorry when i do your guide :
It's display errors:
Unclosed quotation mark before the character string '@int_rowcount int OUTPUT), @int_rowcount OUTPUT

quote:
Originally posted by khtan

then you have to use sp_exeuctesql

try this

declare @sql nvarchar(4000)
select @sql = N'select @int_rowcount = count(hoten) from ' + @MyCode
exec sp_executesql @sql, N'@int_rowcount int OUTPUT), @int_rowcount OUTPUT

KH

KenW
Constraint Violating Yak Guru

391 Posts

Posted - 2006-08-11 : 12:06:04

pamyral,

KH fixed the error in the post just above your last one.

Ken

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2006-08-11 : 12:11:46

http://www.sommarskog.se/dynamic_sql.html

Madhivanan

Failing to plan is Planning to fail

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