Posted by ECRIA Public Mail Buffer on 11/04/36 11:16
SELECT UserID FROM tablename WHERE UserID IN (SELECT UserID FROM tablename
WHERE SkillID=1) AND UserID IN (SELECT UserID FROM tablename WHERE
SkillID=2) AND UserID IN (SELECT UserID FROM tablename WHERE SkillID=3)
However, it may be more efficient for you to redesign your database.