SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


Computed column


Computed column

Author
Message
VM-723206
VM-723206
Ten Centuries
Ten Centuries (1.4K reputation)Ten Centuries (1.4K reputation)Ten Centuries (1.4K reputation)Ten Centuries (1.4K reputation)Ten Centuries (1.4K reputation)Ten Centuries (1.4K reputation)Ten Centuries (1.4K reputation)Ten Centuries (1.4K reputation)

Group: General Forum Members
Points: 1372 Visits: 267
Comments posted to this topic are about the item Computed column
Tom Thomson
Tom Thomson
SSC-Dedicated
SSC-Dedicated (39K reputation)SSC-Dedicated (39K reputation)SSC-Dedicated (39K reputation)SSC-Dedicated (39K reputation)SSC-Dedicated (39K reputation)SSC-Dedicated (39K reputation)SSC-Dedicated (39K reputation)SSC-Dedicated (39K reputation)

Group: General Forum Members
Points: 39484 Visits: 12888
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
Koen Verbeeck
SSC Guru
SSC Guru (111K reputation)SSC Guru (111K reputation)SSC Guru (111K reputation)SSC Guru (111K reputation)SSC Guru (111K reputation)SSC Guru (111K reputation)SSC Guru (111K reputation)SSC Guru (111K reputation)

Group: General Forum Members
Points: 111238 Visits: 13338
Nice question. I was a bit distracted by the select 1 from #table statement, but opted to choose for the error anyway.


How to post forum questions.
Need an answer? No, you need a question.
What’s the deal with Excel & SSIS?
My blog at SQLKover.

MCSE Business Intelligence - Microsoft Data Platform MVP
paul s-306273
paul s-306273
SSCarpal Tunnel
SSCarpal Tunnel (4.7K reputation)SSCarpal Tunnel (4.7K reputation)SSCarpal Tunnel (4.7K reputation)SSCarpal Tunnel (4.7K reputation)SSCarpal Tunnel (4.7K reputation)SSCarpal Tunnel (4.7K reputation)SSCarpal Tunnel (4.7K reputation)SSCarpal Tunnel (4.7K reputation)

Group: General Forum Members
Points: 4654 Visits: 1223
Interesting question.

Keep them coming...
Daniel Bowlin
Daniel Bowlin
SSChampion
SSChampion (13K reputation)SSChampion (13K reputation)SSChampion (13K reputation)SSChampion (13K reputation)SSChampion (13K reputation)SSChampion (13K reputation)SSChampion (13K reputation)SSChampion (13K reputation)

Group: General Forum Members
Points: 13552 Visits: 2629
I was looking for the trick, but couldn't find one. Nice question. Thanks.
OCTom
OCTom
SSCertifiable
SSCertifiable (5.2K reputation)SSCertifiable (5.2K reputation)SSCertifiable (5.2K reputation)SSCertifiable (5.2K reputation)SSCertifiable (5.2K reputation)SSCertifiable (5.2K reputation)SSCertifiable (5.2K reputation)SSCertifiable (5.2K reputation)

Group: General Forum Members
Points: 5171 Visits: 4152
Nice easy one for a Monday morning. Thanks.

I was working with computed columns last week and ran across this issue.
SanjayAttray
SanjayAttray
SSCertifiable
SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)

Group: General Forum Members
Points: 7251 Visits: 1619

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
SanDroid
Hall of Fame
Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)

Group: General Forum Members
Points: 3672 Visits: 1046
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
Koen Verbeeck
SSC Guru
SSC Guru (111K reputation)SSC Guru (111K reputation)SSC Guru (111K reputation)SSC Guru (111K reputation)SSC Guru (111K reputation)SSC Guru (111K reputation)SSC Guru (111K reputation)SSC Guru (111K reputation)

Group: General Forum Members
Points: 111238 Visits: 13338
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.


How to post forum questions.
Need an answer? No, you need a question.
What’s the deal with Excel & SSIS?
My blog at SQLKover.

MCSE Business Intelligence - Microsoft Data Platform MVP
UMG Developer
UMG Developer
SSCertifiable
SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)

Group: General Forum Members
Points: 5932 Visits: 2204
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!
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum







































































































































































SQLServerCentral


Search