Question

I have the following sql statement:

SELECT 1, 2, 3

UNION ALL

SELECT CAST(1 AS VARCHAR) + '%',CAST(2 AS VARCHAR) + '%',CAST(3 AS VARCHAR) + '%'

And I am getting the following error:

Conversion failed when converting the varchar value '1%' to data type int.

I could change the first select statement to ‘1’,’2′,’3′, but i have a many unions and only one row that has to have the percentage format. Is there any other alternatives that are available?

Thanks!

Answer 1

try this

select cast(1 as varchar) ,cast(2 as varchar), cast(3 as varchar)

union all

select cast(1 as varchar) + '%',cast(2 as varchar) + '%',cast(3 as varchar) + '%'

Reason of error is you above select having 1,2,3 which is an integer values and you are doing union with the varchar value

so solution is you need to convert you above select data type to varchar

The second solution is

Select cast(col1 as varchar),cast(col2 as varchar),........... from
(
   .. all your union large query you have writting
) d

union all
select cast(1 as varchar) + '%',cast(2 as varchar) + '%',cast(3 as varchar) + '%'