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SELECT and WHERE without FROM


SELECT and WHERE without FROM

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Koen Verbeeck
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Nice question, thanks.


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Andrew Watson-478275
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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.
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I'd have got it right had I not accidentally clicked Parse instead of Execute! Doze
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Nice question. It makes me smile to see "where 1 = 1" or "while 1 = 1" in code.
phonetictalk
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I'm enjoying the T-SQL questions this week!

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SanDroid
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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

Smooooth
sknox
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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


SQLRNNR
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straight up, fundamental question.



Jason AKA CirqueDeSQLeil
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mtillman-921105
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Terrific question! Thanks.

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Ken Wymore
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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.
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