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Computed column


Computed column

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VM-723206
VM-723206
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Comments posted to this topic are about the item Computed column
TomThomson
TomThomson
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Now wouldn't it be fun if a unification capability were added to SQL so that you in an insert statement could specify the values of some computed columns and leave out the values of some of the non-computed columns and have the database engine compute the set of (new) rows that would satisfy the computations and any constraings (keys, check constraings, etc) and insert them all. w00t

Or maybe not - probably safer to stick to doing that sort of thing in prolog or parlog or something.

Tom

Koen Verbeeck
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Nice question. I was a bit distracted by the select 1 from #table statement, but opted to choose for the error anyway.


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Interesting question.

Keep them coming...
Daniel Bowlin
Daniel Bowlin
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I was looking for the trick, but couldn't find one. Nice question. Thanks.
OCTom
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Nice easy one for a Monday morning. Thanks.

I was working with computed columns last week and ran across this issue.
SanjayAttray
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Create Table #Test (a int, b int, C as a+b )
go
insert into #test values (3,4)
insert into #test values (1,7)
go
select * from #test
order by 1
go
drop table #test
go



Isn't it funny that when you say order by 1, sql server assumes 1 as column and gives result order by column 1 but at the same time when you execute

select 1 from #test

you get result as 1

SQL DBA.
SanDroid
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Nice question for a monday.

I Also give this question Five stars for have correct code and no typos in the question or the answer.
Cool
Koen Verbeeck
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SanjayAttray (11/8/2010)


Isn't it funny that when you say order by 1, sql server assumes 1 as column and gives result order by column 1 but at the same time when you execute

select 1 from #test

you get result as 1


That's because when you use 1 in ORDER BY, you are giving an ordinal position of a column to sort by, while with the SELECT statement, the 1 is an expression.


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Nice question, I would have gotten it wrong had the option for the problem with + not been there. (I didn't see the computed column so once I went looking for the + I immediately knew what was going to happen.

Thanks!
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