T-sql run 1st query and then CASE 2nd query and output data or 'No'

Question

Hey all I am trying to output data if the @blah equals Yes but output 'No' if not.

This is my current query:

DECLARE @blah VARCHAR(MAX)

SET @blah = (SELECT 
   CASE WHEN 
      COUNT(email) = '1' THEN     'Yes'
      ELSE                        'No'
   END
FROM 
   usersTbl 
WHERE 
   email = 'someone@somewhere.com');
SELECT
   CASE WHEN 
      @blah =                     'Yes' THEN 
     (SELECT * 
      FROM 
         usersTbl 
      WHERE 
         email = 'someone@somewhere.com')
      ELSE                        'No'
   END
FROM 
   usersTbl;

Currently the error I am getting with the above is:

Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.

What am I missing?

Answer 1

You could use EXISTS here instead. Something like this.

if exists
(
    SELECT * 
      FROM 
         usersTbl 
      WHERE 
             email = 'someone@somewhere.com'
)
SELECT * 
      FROM 
         usersTbl 
      WHERE 
             email = 'someone@somewhere.com'
ELSE
    select 'No'