Hi,

I have selected a field name and declared it as varchar, since it is
varchar in table and performed some numeric operation with numbers,

even after i cast the sql in below code, it throws an exception as
"Error converting data type varchar to numeric."

code:

CREATE PROCEDURE x1 (@y1 AS numeric=NULL )AS
declare @z1 Varchar(200)

begin
set @z1= 'and a1.id='
print @y1
print @z1
end

Declare r1 cursor
local Scroll Keyset Optimistic
For
select z1 from employee a1 where z2= @z1 + 45 .....


I want to clear that how can we cast the field with varchar for
numeric operations, i have also tried cast and convert to change it
but all in vain.

Thanks in Advance!

meendar (askjavaprogrammers (AT) gmail (DOT) com) writes:
SQL Server tries to convert all values in employee.z2 to numeric, and
when this fails for some value, the query fails.

You need to use the CASE expression:

WHERE CASE WHEN ltrim(rtrim(z2)) NOT LIKE '%[^0-9]%'
THEN convert(numeric, z2)
END = @z1 + 45

Now it will only attempt to convert z2 which it consists of digits only.

--
Erland Sommarskog, SQL Server MVP, esquel (AT) sommarskog (DOT) se

Books Online for SQL Server 2005 at
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On May 2, 12:10 pm, Erland Sommarskog <esq... (AT) sommarskog (DOT) se> wrote:
Thanks to All