Question

I’m declaring a varchar variable in T-SQL

declare @var varchar(max);

I have a select query which returns more than one value. Such as:

Select name from table where ...

I want to append each row to this variable. For example my query returns:

name
----------
 Joe
 Jack
 William
 Avarel

I want my @var to be this: JoeJackWilliamAvarel

How can I do it? I’m writing this query but it gives me error:

Set @var = (Select name from table where ...)

And the error is:

Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

Thank you

Answer 1

SELECT
  @var = @var + name
FROM
  table
WHERE
  ...
ORDER BY
  ...

But make sure @var does NOT start as NULL. @set @var = ''.