I'm having trouble with a query that I thought would be pretty
straightforward. To simplify, I have a database of books that
has, say, two tables:
CREATE TABLE book (
id INT,
date_purch DATE
)
CREATE TABLE subj (
book_id INT,
subj TEXT
)
Each book can have any number of subjects, and each book has
at least one subject.
I'd like to get all subjects that are in the subject table
that are _not_ represented in a particular date range. For
example, if I have bought books with subjects 'Computing',
'Cooking', 'Baseball', and 'Fiction', but in the last six
months I have only bought Fiction and Baseball, I'd like a
query that will give me Computing and Cooking.
I played around with a few LEFT JOINS but I still seem to be
missing something.
Thanks.
Jesse Sheidlower
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