Comments on: The effects UNION in a SQL query http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/ We provide clever, unique, and flexible solutions Sat, 21 Jan 2012 18:33:58 +0000 hourly 1 http://wordpress.com/ By: My Most Popular Posts From 2010 « WebbTech Solutions http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-959 Thu, 27 Jan 2011 12:06:00 +0000 http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-959 [...] The effects UNION in a SQL query [...]

]]> By: shyam http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-241 Thu, 17 Sep 2009 16:31:59 +0000 http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-241 How to write a query without using JOIN Statement.

]]> By: Log Buffer #158: a Carnival of the Vanities for DBAs | Pythian Group Blog http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-154 Fri, 14 Aug 2009 17:40:24 +0000 http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-154 [...] Joe Webb of WebbTech Solutions exposes some some not-so-obvious side-effects UNION in a SQL query. [...]

]]> By: Joe Webb http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-148 Mon, 10 Aug 2009 14:06:31 +0000 http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-148 Virgil –

That’s a great question. The best way to determine optimal performance for you unique and specific situation is to develop 2-4 queries and then look at the response times and execution plans.

HTH…

Joe

]]> By: Joe Webb http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-147 Mon, 10 Aug 2009 13:58:40 +0000 http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-147 mesut – I’m glad you found this useful; thanks for letting me know.

I’ve got a couple of more blogs coming soon that focus on improving performance by making relatively minor changes to your code like this. Stay tuned.

Joe

]]> By: mesut http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-145 Sun, 09 Aug 2009 15:13:09 +0000 http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-145 I solved some performance problems by using “Union All”. I was lucky because there was no duplicity problems.

I realized that our all Union queries were just “Union”. So, there was a huge performance tuning potential that our developers didn’t notice before.

]]> By: Dew Drop – August 7, 2009 | Alvin Ashcraft's Morning Dew http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-143 Fri, 07 Aug 2009 12:12:58 +0000 http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-143 [...] The effects UNION in a SQL query (Joe Webb) [...]

]]> By: Virgil http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-142 Thu, 06 Aug 2009 14:49:34 +0000 http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-142 Interesting article, I have a question :

If I have a table / view like this :

id1 , attribute fields line 1
id1 , attribute fields line 2
id2 , attribute fields line 3
id2 , attribute fields line 4
—
idn , attribute fields line j
idn , attribute fields line j+1
idn , attribute fields line j+2

what would be the cheapest way to show only one line per id ? And I really don’t care which would be that line, all I care for this is performance…

Thank you very much!

]]> By: SqlServerKudos http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-141 Thu, 06 Aug 2009 13:52:40 +0000 http://webbtechsolutions.com/2009/08/06/the-effects-union-in-a-sql-query/#comment-141 The effects UNION in a SQL query « WebbTech Solutions…

Kudos for a great Sql Server article – Trackback from SqlServerKudos…

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