Re: MS SQL isnull equivalent

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#11333

From: Craig Stuntz TeamB
Date: Wed, 27 Nov 2002 19:55

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In article <3de51bfc$1@newsgroups.borland.com>, "Arno Brinkman" 
<bnewsgroups @ abvisie.nl> says...
> SELECT
>   <select_list>
> FROM
>   ATable
> WHERE
>   AField IS NULL
> UNION
> SELECT
>   <select_list>
> FROM
>   ATable
> WHERE
>   AField IS NOT NULL
> 
	I recommend using UNION ALL here instead of UNION -- it's much 
faster.

	-Craig

-- 
Craig Stuntz [TeamB] � Vertex Systems Corp. � Columbus, OH
Delphi/InterBase Weblog : http://delphi.weblogs.com
InterBase Perf. Monitor : http://delphi.weblogs.com/IBPerformanceMonitor
InterBase PLANalyzer 1.1: http://delphi.weblogs.com/IBPLANalyzer

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From: Craig Stuntz [TeamB] <cstuntz@nospamplease.com  (but use vertexsoftware to email)>
Newsgroups: borland.public.interbase.sql
Subject: Re: MS SQL isnull equivalent
Date: Wed, 27 Nov 2002 14:55:29 -0500
Message-ID: <MPG.184eed3c23f7878e98a29d@newsgroups.borland.com>
References: <3de512a8$1@newsgroups.borland.com> <3de51bfc$1@newsgroups.borland.com>
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