Relational Algebra - Join Operator?

S| A| B|.........T| C| D|
..| x | y|...........| x| x|
......................| x| y|
......................| y| y|

So.... [S(join) b=c T] equals what? And how did you come to that answer???

Thanks for any help you can give.
Update: Ha! I am studying for that test mate! Ive worked it out though. Basically im just gonna do it the long way and do S x T and then find the tuples in common like it says here :

http://www.databasteknik.se/webbkursen/relalg-lecture/index.html
Update 2: My laptops a piece of crap and I dont have powerpoint on it :(

Good luck tomorrow though!
Update 3: Yeah thats the answer I got too.
Update 4: Yeah Im in CA. Pulling a wicked all nighter to scrape a pass for this!
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