<a href="http://g.adspeed.net/ad.php?do=clk&zid=15220&wd=468&ht=60&pair=as" target="_blank"><img style="border:0px;" src="http://g.adspeed.net/ad.php?do=img&zid=15220&wd=468&ht=60&pair=as" alt="i" width="468" height="60"/></a>
Log in
::
Register
::
Not logged in
Home
Tags
Articles
Editorials
Stairways
Forums
Scripts
Videos
Blogs
QotD
Books
Ask SSC
SQL Jobs
Training
Authors
About us
Contact us
Newsletters
Write for us
<a href="http://g.adspeed.net/ad.php?do=clk&zid=15491&wd=120&ht=300&pair=as" target="_top"><img style="border:0px;" src="http://g.adspeed.net/ad.php?do=img&zid=15491&wd=120&ht=300&pair=as" alt="i" width="120" height="300"/></a>
Recent Posts
Recent Posts
Popular Topics
Popular Topics
Home
Search
Members
Calendar
Who's On
Home
»
Article Discussions
»
Article Discussions by Author
»
Discuss content posted by Mohammed Moinudheen...
»
ROWGUIDCOL
28 posts, Page 2 of 3
««
1
2
3
»»
ROWGUIDCOL
Rate Topic
Display Mode
Topic Options
Author
Message
Koen Verbeeck
Koen Verbeeck
Posted Tuesday, March 08, 2011 7:25 AM
SSCrazy Eights
Group: General Forum Members
Last Login: Yesterday @ 6:54 AM
Points: 9,364,
Visits: 6,462
Tom.Thomson (3/8/2011)
Interesting question.
There is however a problem with use of imprecise English - this is of course sheer nit-picking, and I'm not complaining because I guessed that the chances were better than even that imprecise English was being used so that I got it "right" by deliberately selecting an answer I knew to be wrong.
The right answer of course is "each of them can (but only one at a time)" so of the options provided 3 is closest to correct. 1 (the "right" answer) would only be
really
correct if the question was "how many of them can be rowguidcol columns at the same time".
You are right, it is sheer nit-picking
However, it does not make your point less valid...
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
LessThanDot
.
MCSA SQL Server 2012 - MCSE Business Intelligence
Post #1074779
SanDroid
SanDroid
Posted Tuesday, March 08, 2011 7:50 AM
Ten Centuries
Group: General Forum Members
Last Login: Thursday, January 31, 2013 8:01 AM
Points: 1,232,
Visits: 1,046
Tom.Thomson (3/8/2011)
The right answer of course is "each of them can (but only one at a time)" so of the options provided 3 is closest to correct. 1 (the "right" answer) would only be
really
correct if the question was "how many of them can be rowguidcol columns at the same time".
I have to agree to disagree with this statement.
"enabled" is the key word in this question and makes perfect english as the last word in the question. This makes it the main describer for the question.
You can "enable" ROWGUIDCOL on any UID column in a table, but it can only be "enabled" on one row.
When something is done and the switch is on it is
enabled
.
The concept I learned from the question is that enabling ROWGUID on any column automaticly disables it on all other columns when using Table Designer.
When being done from a script the DDL you have to use to make another column the ROWGUIDCOL really brings home why the question makes perfect sense.
Create a table called Table_1 give it three UID columns and set the first or second one to ROWGUID.
CREATE TABLE [dbo].[Table_1](
[uid01] [uniqueidentifier] ROWGUIDCOL NULL,
[uid02] [uniqueidentifier] NULL,
[uid03] [uniqueidentifier] NULL
) ON [PRIMARY]
ALTER TABLE [dbo].[Table_1] ADD CONSTRAINT [DF_Table_1_uid01] DEFAULT (newid()) FOR [uid01]
ALTER TABLE [dbo].[Table_1] ADD CONSTRAINT [DF_Table_1_uid02] DEFAULT (newid()) FOR [uid02]
ALTER TABLE [dbo].[Table_1] ADD CONSTRAINT [DF_Table_1_uid03] DEFAULT (newid()) FOR [uid03]
GO
Now try to Alter the table and set any other column to ROWGUID.
ALTER TABLE dbo.Table_1 ALTER COLUMN uid02
ADD ROWGUIDCOL
GO
It can't be done because ROWGUIDCOL is already enabled on another COLUMN and it can only be enabled on ONE column. This looks really wierd when using the querry designer becuase it will let you select YES to the option on any column, but it is only enabled on the last one you pick.
Try it out.
BEGIN TRANSACTION
ALTER TABLE dbo.Table_1 ALTER COLUMN uid03
DROP ROWGUIDCOL
GO
ALTER TABLE dbo.Table_1 ALTER COLUMN uid02
ADD ROWGUIDCOL
GO
COMMIT
So lets read the qustion again:
How many UID columns in a table can have ROWGUIDCOL enabled?
You can enable it on any UID column in a table, but it can only be
enabled
on one column.
One last thing to point out about ROWGUIDCOL property is that differant from an Identity Column, the Object explorer gives you no clues about which column has ROWGUIDCOL enabled.
Post #1074815
Daniel Bowlin
Daniel Bowlin
Posted Tuesday, March 08, 2011 8:45 AM
SSCrazy
Group: General Forum Members
Last Login: Yesterday @ 11:53 AM
Points: 2,672,
Visits: 2,416
I guess my question is, once you have a GUID, what is the point of the other unique columns?
Post #1074865
Surii
Surii
Posted Tuesday, March 08, 2011 9:56 AM
SSChasing Mays
Group: General Forum Members
Last Login: Thursday, February 21, 2013 5:19 PM
Points: 658,
Visits: 455
nice and easy one..
Post #1074938
mohammed moinudheen
mohammed moinudheen
Posted Tuesday, March 08, 2011 10:14 AM
SSCrazy
Group: General Forum Members
Last Login: 2 days ago @ 3:34 PM
Points: 2,170,
Visits: 3,582
Daniel Bowlin (3/8/2011)
I guess my question is, once you have a GUID, what is the point of the other unique columns?
I think there is no point in adding other unique colums. I just happened to read about GUID's and thought of this question.
Mohammed Moinudheen
Post #1074952
john.arnott
john.arnott
Posted Tuesday, March 08, 2011 11:04 AM
UDP Broadcaster
Group: General Forum Members
Last Login: Wednesday, April 17, 2013 10:57 PM
Points: 1,491,
Visits: 3,008
Tom.Thomson (3/8/2011)
Interesting question.
There is however a problem with use of imprecise English - this is of course sheer nit-picking, and I'm not complaining because I guessed that the chances were better than even that imprecise English was being used so that I got it "right" by deliberately selecting an answer I knew to be wrong.
The right answer of course is "each of them can (but only one at a time)" so of the options provided 3 is closest to correct. 1 (the "right" answer) would only be
really
correct if the question was "how many of them can be rowguidcol columns at the same time".
Tom, you've shown that you'd never have trouble with this riddle: If I have two American coins with a total value of 30 cents and one of them is not a quarter, what are they?
Post #1074986
SQLRNNR
SQLRNNR
Posted Tuesday, March 08, 2011 11:52 AM
SSCoach
Group: General Forum Members
Last Login: 2 days ago @ 1:46 PM
Points: 18,732,
Visits: 12,329
Daniel Bowlin (3/8/2011)
I guess my question is, once you have a GUID, what is the point of the other unique columns?
Sadly, there are numerous products that use it as the PK as well as FKs in child tables. Thus there would be several GUIDs. One example of such a product is Microsoft Dynamics CRM.
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 #1075023
SQLRNNR
SQLRNNR
Posted Tuesday, March 08, 2011 11:53 AM
SSCoach
Group: General Forum Members
Last Login: 2 days ago @ 1:46 PM
Points: 18,732,
Visits: 12,329
Thanks for the 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 #1075024
UMG Developer
UMG Developer
Posted Tuesday, March 08, 2011 12:14 PM
SSCrazy
Group: General Forum Members
Last Login: Monday, May 13, 2013 11:21 AM
Points: 2,163,
Visits: 2,148
Thanks for the question, I did have to go read in BOL to figure out how to answer it, so I learned something.
Post #1075040
L' Eomot Inversé
L' Eomot Inversé
Posted Tuesday, March 08, 2011 6:03 PM
SSCertifiable
Group: General Forum Members
Last Login: Today @ 11:59 AM
Points: 7,076,
Visits: 7,115
SanDroid (3/8/2011)
Tom.Thomson (3/8/2011)
The right answer of course is "each of them can (but only one at a time)" so of the options provided 3 is closest to correct. 1 (the "right" answer) would only be
really
correct if the question was "how many of them can be rowguidcol columns at the same time".
I have to agree to disagree with this statement.
"enabled" is the key word in this question and makes perfect english as the last word in the question. This makes it the main describer for the question.
I don't think the word "enabled" helps at all. The way the question is phrased would allow it to help only if the word "simultaneously" were inserted between "can" and "have" (or after "enabled" if a little sloppiness is permitted).
Tom
Que conclure à la fin de tous mes longs propos? C'est que les préjugés sont la raison des sots. (Voltaire, 1756)
Post #1075248
« Prev Topic
|
Next Topic »
28 posts, Page 2 of 3
««
1
2
3
»»
Permissions
You
cannot
post new topics.
You
cannot
post topic replies.
You
cannot
post new polls.
You
cannot
post replies to polls.
You
cannot
edit your own topics.
You
cannot
delete your own topics.
You
cannot
edit other topics.
You
cannot
delete other topics.
You
cannot
edit your own posts.
You
cannot
edit other posts.
You
cannot
delete your own posts.
You
cannot
delete other posts.
You
cannot
post events.
You
cannot
edit your own events.
You
cannot
edit other events.
You
cannot
delete your own events.
You
cannot
delete other events.
You
cannot
send private messages.
You
cannot
send emails.
You
may
read topics.
You
cannot
rate topics.
You
cannot
vote within polls.
You
cannot
upload attachments.
You
may
download attachments.
You
cannot
post HTML code.
You
cannot
edit HTML code.
You
cannot
post IFCode.
You
cannot
post JavaScript.
You
cannot
post EmotIcons.
You
cannot
post or upload images.
Copyright © 2002-2013 Simple Talk Publishing. All Rights Reserved.
Privacy Policy.
Terms of Use.
Report Abuse.
