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Discuss Content Posted by Patrick LeBlanc
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SELECT and WHERE without FROM
29 posts, Page 2 of 3
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SELECT and WHERE without FROM
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Koen Verbeeck
Koen Verbeeck
Posted Thursday, June 23, 2011 3:14 AM
SSCrazy Eights
Group: General Forum Members
Last Login: Today @ 7:39 AM
Points: 9,370,
Visits: 6,467
Nice question, thanks.
How to post forum questions.
Need an answer? No, you need a question.
What’s the deal with Excel & SSIS?
Member of
LinkedIn
. My blog at
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MCSA SQL Server 2012 - MCSE Business Intelligence
Post #1130241
Andrew Watson-478275
Andrew Watson-478275
Posted Thursday, June 23, 2011 3:17 AM
SSC Eights!
Group: General Forum Members
Last Login: Saturday, May 18, 2013 1:44 AM
Points: 953,
Visits: 1,875
You don't even need the WHERE clause. I've just done an SSIS step where I needed a single row returned, but didn't care about the contents, so I used
SELECT 1
and it worked fine.
Post #1130243
jkraemer
jkraemer
Posted Thursday, June 23, 2011 8:03 AM
Forum Newbie
Group: General Forum Members
Last Login: Monday, July 09, 2012 12:09 PM
Points: 6,
Visits: 16
I'd have got it right had I not accidentally clicked Parse instead of Execute!
Post #1130445
SanDroid
SanDroid
Posted Thursday, June 23, 2011 8:07 AM
Ten Centuries
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Last Login: Thursday, January 31, 2013 8:01 AM
Points: 1,232,
Visits: 1,046
Nice question. It makes me smile to see "where 1 = 1" or "while 1 = 1" in code.
Post #1130453
phonetictalk
phonetictalk
Posted Thursday, June 23, 2011 8:15 AM
SSC Veteran
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Last Login: Friday, May 10, 2013 8:09 AM
Points: 254,
Visits: 1,056
I'm enjoying the T-SQL questions this week!
Leonard
Madison, WI
Post #1130461
SanDroid
SanDroid
Posted Thursday, June 23, 2011 8:22 AM
Ten Centuries
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Last Login: Thursday, January 31, 2013 8:01 AM
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Andrew Watson-478275 (6/23/2011)
You don't even need the WHERE clause. I've just done an SSIS step where I needed a single row returned, but didn't care about the contents, so I used
SELECT 1
and it worked fine.
I think the concept the question was testing is;
"Do you need a From clause to use a where clause?"
I hope we all understand that a where clause is not needed for a SELECT statement.
i.e. SELECT @ParameterName = @@Version
SELECT @ParameterName
Post #1130467
sknox
sknox
Posted Thursday, June 23, 2011 9:00 AM
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Carlo Romagnano (6/23/2011)
If the condition of the WHERE clause validates to true then the result set is returned. If it does not, the result set is empty.
This is true only if you do not use COUNT(*):
select count(*) cnt
where 1 =0
One row is returned despite the WHERE condition is false.
This is true of aggregate functions, not just COUNT(*) -- the where condition filters the input to the aggregate functions, not the output from them.
Try
select sum(5)
where 1 = 0
Post #1130510
SQLRNNR
SQLRNNR
Posted Thursday, June 23, 2011 9:13 AM
SSCoach
Group: General Forum Members
Last Login: Yesterday @ 1:07 PM
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straight up, fundamental question.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp
Post #1130538
mtillman-921105
mtillman-921105
Posted Thursday, June 23, 2011 9:40 AM
Right there with Babe
Group: General Forum Members
Last Login: Friday, May 10, 2013 11:54 AM
Points: 749,
Visits: 3,767
Terrific question! Thanks.
______________________________________________________________________
The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge. - Stephen Hawking
Post #1130583
KWymore
KWymore
Posted Thursday, June 23, 2011 10:44 AM
SSCrazy
Group: General Forum Members
Last Login: Today @ 8:52 AM
Points: 2,574,
Visits: 1,532
Nice question. I have used the "select '123' " or "select 5" syntax before but didn't think to ever try a where clause with it.
Post #1130652
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