SQL - Stumped on a SELECT - please help!

Question

I\'m trying to achieve the following in SQL Server 2005:

SELECT (IF EITHER EXISTS) usr.username, pro.email
FROM table1 AS usr, table2 AS pro
WHERE usr.username = \'ex         


        

Answer 1

select usr.username, pro.email
from table1 as usr
inner join table2 as pro on
  usr.id = pro.userId --I'm guessing on the relationship here
where 
  usr.usrname = 'existing_username' or
  pro.email = 'existing_email'

Alternately, you could union results from both tables together:

(select username, null as email from table1)
union
(select null as username, email from table2)

The union will give you results if you don't have a relationship between the tables.