For example. I have a database upgrade script for adding a column to a database table. It looks a little like this:
IF NOT Exists(SELECT * FROM SysColumns sc, SysObjects so
WHERE sc.Name = 'dealer_number'
AND so.Name = 'collector'
AND so.Type= 'U'
AND so.id = sc.id)
BEGIN
-- SQL for creating column
END
ELSE
BEGIN
-- notify user that column already exists
END
How do I notify the user that the column already exists?
RAISERROR ('column already exists',0,1) with nowait
or
print 'column already exists'