Sql register

hi how can i make a web site script

query to check serial in db ( lalalala)
and register account



for exemple i make a automatic system to paleyrs buy key and receiv in email.

ok player have the key

he come to site

put key and make login= email pass = pass


and it show account sucess created or invalid serial key
or account already in use


web coders help me *-* pls

Why you need a register when you can register in launcher whith serialgen ?

because it in DNC Files are disable and api etc dont is confiable
key generator already done automatic i need only register script

email
pass
check box


sql query *-*