SQL Code

I am having trouble trying to write some SQL code with discounting. Lets say customers who are part of a program gets 15% discount off books.

How should I write that in SQL Code?

>>1
First you'll have to go back to India, Rasheed. Then I'm going to have to ask you and your fifty wives to get right out of the IT industry and go wash some clothes in your nasty dirty river.

I fucking hate Indians.

Also, >>1, even if you aren't a damn Indian, you're as dumb as one, so it doesn't really matter.

FUKKEN SAGED