Thank you very much for prompt response. I grateful for your observations.
No. One account which can be savings/current (accno) to one customer. I hope i understand what you mean't "to add data to a field named cusid in the accounts table but there is no such field as your table was created."? I created cusid field in the customer's table "`cusid` int(4) NOT NULL AUTO_INCREMENT, " Let me try as u observed.
Thanks for your wonderful time!