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

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Extracting Data from multiple archive tables(SQL Server)

I am developing a report in report builder 3.0 where i am extracting data from a table dbo.odcalls. now the problem is this table is archived on monthly basis on a seperate database(HN_Backup) and i ...
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1answer
37 views

UNION or SELF JOIN?

I have a table to hold parent and child posts together. +------+----------------+--------------+-------------+------------+ | p_id | parent_post_id | child_status | post_status | post_title | ...
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1answer
31 views

To find out the sum total of GRNQty and GRNValue of particular item from column 1

Query 1 # SELECT spi.Item,spi.ItemName,supdd.PackageID,spi.Specifics,iteb.brandname,supdd.Qty AS GRNQty,supdd.GP AS UnitPrice,(supdd.Qty * Supdd.GP) AS GRNValue FROM suppdeldetail AS supdd ...
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39 views

Better ways than rownum limits on a union all for fallback-style queries?

I have three queries that generates some "reference" statistics and should be tried in order until one returns a result. These are currently coded as three separate calls to the DB, but I want to ...
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59 views

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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116 views

How to improve performance when joining against coalesce

In an effort to remove a caching layer from our application, I'm building a number of views to encapsulate the different ways a user can have access to a piece of content - one per "rule" of access. ...
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54 views

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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8 views

MySQL editable reports from multiple identical tables

Let's say I have two sets of four identical tables for my sales that are generated by our apparatus. The first set represents each sales made in a region. Sales_Canada_Est, Sales_Canada_West, ...
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22 views

Is it possible to stack similar columns from a subquery and join the other unique columns in one query?

I am fairly new to the sql world and have been struggling with a query. I have two subqueries that are generating tables with two columns. The first table is part # and model_countH. The second table ...
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44 views

Merge two data tables with different time preferably in access

I appreciate if I could help on this issue. I am relatively beginner to database designs. I have two tables (see link below) which I would like to combine: Tbl_1: Date, Product, Sold Tbl_2: Date, ...
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496 views

Performance of VIEWs with UNIONs in different databases

For various corporate and historical and replicating reasons, I have multiple databases that contain similar-structured tables, holding the main production data used as a source for other home-made ...
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27 views

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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79 views

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 ...