The set of all distinct rows from two or more result sets.

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The best way to query a partitioned table in Oracle

I have a table in an Oracle database, partitioned by a field. In our application we need to query data that is scatered across 2 partitions. Can you please tell me which method is better: making ...
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Optimizing a union query

SELECT id FROM user WHERE id IN ( 2,3,4,7,9,21,23,45,324,12,43,254 ) UNION SELECT DISTINCT user_id FROM workgroup_users WHERE workgroup_id IN ( 1,345,34,654,213,123,5,2,3,4 ) I know we should not ...
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Does union all have an enforced ordering

I know that a union does a de-duplication so can jumble the results, but I can't find a definitive answer for union all Example query select id from ( select id from table where id = 1 union all ...
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Combining 2queries: One filtered Users on Role, One Select users with only one specific role

First query: Selects All users with specific rid ( 3 or 4 or 19 or ...). SELECT u.uid AS uid, u.name AS name, fn.field_full_name_value AS field_full_name_value FROM users u LEFT OUTER ...
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Optimization of an old query multiple unioned subqueries

I am currently in the process of optimizing a large query that was written for oracle 8i. My company currently uses oracle 10g which gives us a lot of options for optimization. Please Reference the ...
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dynamic sql: merge partitioned tables (annual tables into a single table of all years)

I need to merge (UNION) data from annual tables into one large table. I am confused about how dynamic SQL (or else) should be used for this. Below is an updated version of my question on ...
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Union within derived table, (related_id=a AND related_id=b) OR (related_id=z)

I have the following tables: users, tags, tags_data. tags_data contains tag_id and user_id columns to link the users with tags in a 1 user to many tags relationship. What is the best way of listing ...
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Union All - Always zero on two fields

I wrote a football table program for my friends and they would really like to have some more statistics in it. But I'm stumbling about getting total wins and lose for the red and black team (W_S = win ...