Question

I am trying to convert varchar to bigint:

select convert(bigint, (select(Replace((select value from sometable), ' ', ''))))

Why is it giving error???

Error converting data type varchar to bigint.

thanks in advance

Update

This is part of query I am trying:

select top 1 * 
into #tblTemp 
from testTable 
where Status = 0 
order by Sno

declare @mobile varchar(50)

set @mobile = (select(Replace((select mobile from #tblTemp), ' ', '')))

--set @mobile = (select( Replace(' 9428017524', ' ', '')))

select convert(bigint, @mobile)

drop table #tblTemp

Answer 1

I am not sure what your real string is but for safety you can check ISNUMERIC() before convertion.

DECLARE @mobile varchar(50)
SELECT @mobile = REPLACE(mobile, ' ','') --much simplified version
FROM #tblTemp 

IF ISNUMERIC(@mobile)
   SELECT CONVERT(bigint, @mobile)
ELSE
   SELECT 0

Just by reading your queries, you don't need a temp table here at all. Everything can be done in a single query

SELECT TOP (1) CONVERT(bigint,  CASE ISNUMERIC( REPLACE(mobile,' ','') ) 
                                   WHEN 1 THEN REPLACE(mobile,' ','')
                                   ELSE 0 END )
FROM testTable 
WHERE Status = 0 
ORDER By Sno