First of all, that's very little information to go on. What kind of data do
you need to store for your internet cafe? What kind of output do you expect?
There are tons of other questions that any developer would ask you before he
or she could get started on creating a database for you. Second, the time
involved in doing that is probably pretty extensive and anyone who did that
for you would deserve to be paid for his or her services. I don't know if
there is a pre-designed database for an internet cafe that someone is going
to just hand you on a silver platter.
