Poll based SQL Cache dependency on more than one table

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ASP.NET

C#3.5

cache

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I am trying to implement Sql Caching in asp.net using Poll base. I refer this link http://www.dotnetfunda.com/articles/show/1382/how-to-implement-sql-caching-in-aspnet-poll-based-sql-cache-dependency
In that example they provide operation on one table(ie select query on one table) but I want to perform operation on multiple table. ie In query I want some joins,sub query etc. So how can I perform Operation on multiple tables.I am beginner so please provide me some example so I can refer that example.

thank you