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Old 02-28-2008, 10:29 AM
herbasher
 
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Default Counting number of associated many-to-many items

Hello!

I have three tables, mapping out a n:n relationship of authors and the
books they worked on:

table 1: authors (id, name)
table 2: authorships (author_id, book_id)
table 3: books (id, name, bestseller tinyint)

Here's two different queries I want to run:

1. Select each author, and how many books he has worked on.
2. Select each author, and how many bestseller books (bestseller = 1)
he has worked on.


Not exactly sure how to do this, can someone help me out with this?



Thank you,
Rob

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