Find rows with parameter in one of two columns?

Question

I have this table and need help

Friends:

My_E_Mail (VARCHAR) Friends_E_Mail(VARCHAR) 
alester@pam.com carl@pam.com
alester@pam.com greg@pam.com
alester@pam.co         


        

Answer 1

Try

DELCARE @email VARCHAR(50) = ?
WITH FRIENDS_CTE (My_E_Mail, Friend_E_Mail)
AS
(
  SELECT My_E_Mail, Friends_E_Mail
  FROM FRIENDS
  WHERE My_E_Mail = @email
  UNION 
  SELECT Friends_E_Mail, My_E_Mail
  FROM FRIENDS
  WHERE Friends_E_Mail = @email
)
SELECT Friend_E_Mail
FROM FRIENDS_CTE
WHERE My_E_Mail = @email

Answer 2

Maybe this code will help you

select Friend_E_Mail
From Friends 
WHERE 'carl@pam.com' NOT IN(Friend_E_Mail, My_E_Mail)