| From: | msi77 <msi77(at)yandex(dot)ru> |
|---|---|
| To: | "Ozer, Pam" <pozer(at)automotive(dot)com>,pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: Getting top 2 by Category |
| Date: | 2011-01-11 20:00:55 |
| Message-ID: | 143611294776056@web61.yandex.ru |
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| Lists: | pgsql-sql |
There some ways to do this in one query. Look here:
http://www.sql-ex.ru/help/select16.php
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11.01.11, 22:00, "Ozer, Pam" <pozer(at)automotive(dot)com>:> This is probably very simple but I am drawing a blank. Do I need to create a cursor to iterate through a table to grab the top 2 magazines per category? Here is my table and some data . The results I need are at the bottom. Any help would be greatly appreciated: CREATE TABLE magazinecategory( magazinecategoryid smallint NOT NULL , magazineid smallint, categoryid smallint); INSERT INTO magazinecategory( magazinecategoryid, magazineid, categoryid) VALUES (1, 2, 3); INSERT INTO magazinecategory( magazinecategoryid, magazineid, categoryid) VALUES (2, 8, 3); INSERT INTO magazinecategory( magazinecategoryid, magazineid, categoryid) VALUES (3 9, 3); INSERT INTO magazinecategory( magazinecategoryid, magazineid, categoryid) VALUES (4, 10, 4); INSERT INTO magazinecategory( magazinecategoryid, magazineid, categoryid) VALUES (5, 11, 4); INSERT INTO magazinecategory( magazinecategoryid, magazineid, categoryid) VALUES (6, 12,4); The results I want areCategoryID MagazineID3 23 84 104 11 Pam Ozer>
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