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SELECT and WHERE without FROM


SELECT and WHERE without FROM

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Patrick_LeBlanc
Patrick_LeBlanc
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Comments posted to this topic are about the item SELECT and WHERE without FROM



bitbucket-25253
bitbucket-25253
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Nice question on fundamentals .. thanks

If everything seems to be going well, you have obviously overlooked something.

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M&M
M&M
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Good question. I got to know something.

M&M
sayyad.azhar
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Very Good basic question !
paul.knibbs
paul.knibbs
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I looked at the question, thought, "Surely this is obvious"--went and ran it in SSMS just to be sure I wasn't missing something. It was only when I came here I realised it was talking about the missing FROM clause! :-)
Carlo Romagnano
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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.
Geoff Langdon
Geoff Langdon
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Interestingly, this gives ORA-00923 error - FROM keyword not found where expected in Oracle.
(Hence I got it wrong!)
paul s-306273
paul s-306273
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Geoff Langdon (6/23/2011)
Interestingly, this gives ORA-00923 error - FROM keyword not found where expected in Oracle.
(Hence I got it wrong!)


Geoff how about:

1 select '123' as col1
2 from dual
3* where 1 =1
orhousin@BUSO> /

COL
---
123

I was expecting this question to have almost 100% correct answers...
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
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Having worked with MSSQL, Oracle, Db2, Sybase and Informix databases, the only ones this command will work on is MSSQL and Sybase.
All the others require a FROM clause with a SELECT

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Hardy21
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Nice question

Thanks
Go


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