Query query
От | Andrew Bell |
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Тема | Query query |
Дата | |
Msg-id | 5.1.0.14.2.20011127125342.04b61900@acbell.mail.iastate.edu обсуждение исходный текст |
Ответы |
Re: Query query
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Список | pgsql-novice |
Hi, You have all been so helpful, I'm going to bother you with another. Say that you have a table with two categories. I want to do a *single* query that shows the number of things in each of the primary category that match a constraint and the number of things that don't match that constraint. Given the following table and the constraint cat2 = 1 cat1 | cat2 A 1 B 1 A 2 B 2 B 3 B 3 I want to generate output that looks like: cat1 | count | count A 1 1 B 1 3 Where the first 'count' represents the number of things that match the constraint, and the second 'count' represents the number of things that doesn't match the constraint. Can this be done? If so how? Thanks, -- Andrew Bell acbell@iastate.edu
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