How do I create a multiple-table check constraint?

Question

Please imagine this small database...

Diagram

removed dead ImageShack link - volunteer database diagram

Tables

Volunteer         


        

Answer 1

There is a way to do it by using triggers, which i wouldn't recommend. I would recommend not putting your buisness logic at the database level. The db doesn't need to know who, is staffing a certain shift at which time. That logic should be put in your buisness layer. I would recommend using a repository construction pattern. Scott gutherie has a very good chapter in his mvc 1.0 book which describes this (Link below).

http://weblogs.asp.net/scottgu/archive/2009/03/10/free-asp-net-mvc-ebook-tutorial.aspx