sql "Group By" and "Having"

Posted by Hans Rudel on Stack Overflow See other posts from Stack Overflow or by Hans Rudel
Published on 2012-06-13T10:36:26Z Indexed on 2012/06/13 10:39 UTC
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sql

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sql-server

im trying to work through some questions and im not sure how to do the following

Q:Find the hard drive sizes that are equal among two or more PCs.

its q15 on this site http://www.sql-ex.ru/learn_exercises.php#answer_ref

The database scheme consists of four tables:

Product(maker, model, type)
PC(code, model, speed, ram, hd, cd, price)
Laptop(code, model, speed, ram, hd, screen, price)
Printer(code, model, color, type, price)

any pointers would be appreciated.

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