Help in building advanced query

Hi all,

I need to build an SQL query invloving 3 tables and I'm a bit stuck (it's that time of day).

I have the following three tables:

Mat2Prod, with columns "Code" and "Product"
Mat2Age, with colums "Code" and "Age"
Mat, with "Code" (and others)

I need to find all rows in Mat where Product = $var1 and Age = $var2, with both of the $vars given.

I've done joins before with 2 tables but with three my head starts hurting. Any help appreciated!

SELECT a.*, b.*, c.*
FROM Mat2Prod a, Mat2Age b, Mat c
WHERE a.Code = b.Code
AND a.Code = c.Code
AND a.Product = $var1
AND b.Age = $var2

Many thanks!