Sql exists

If exists sql server

IF EXISTS (SELECT * FROM tblGLUserAccess WHERE GLUserName ='xxxxxxxx') 
BEGIN
   SELECT 1 
END
ELSE
BEGIN
    SELECT 2
END

Source: stackoverflow.com

Sql exists

Checks for the existence of any record within the subquery, returning true if
one or more records are returned.
Example: Lists any dealerships with a deal finance percentage less than 10.
SELECT dealership_name
FROM dealerships
WHERE EXISTS (SELECT deal_name FROM deals WHERE
dealership_id = deals.dealership_id AND finance_
percentage < 10);

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