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Discuss content posted by Paul Randal
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Primary Keys
40 posts, Page 4 of 4
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Jamie Longstreet-481950
Jamie Longstreet-481950
Posted Sunday, March 21, 2010 8:04 AM
SSCrazy
Group: General Forum Members
Last Login: Wednesday, May 22, 2013 8:48 AM
Points: 2,440,
Visits: 714
When are Kim and Paul coming to Atlanta... this sounds like a great lecture.
Jamie
Post #887070
Paul White
Paul White
Posted Tuesday, March 30, 2010 8:13 AM
SSChampion
Group: General Forum Members
Last Login: Today @ 5:01 PM
Points: 10,990,
Visits: 10,545
Good question, but the wording could have been clearer. Nice easy points though - thanks.
Paul White
SQL Server MVP
SQLblog.com
@SQL_Kiwi
Post #892804
C.K.Shaiju
C.K.Shaiju
Posted Thursday, April 01, 2010 1:18 AM
SSC-Enthusiastic
Group: General Forum Members
Last Login: Sunday, March 03, 2013 10:42 PM
Points: 179,
Visits: 561
Hi Hugo,
The 3rd and 6th options seems similar.
Shaiju C.K.
Post #894476
Hugo Kornelis
Hugo Kornelis
Posted Thursday, April 01, 2010 1:33 AM
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C.K.Shaiju (4/1/2010)
Hi Hugo,
The 3rd and 6th options seems similar.
Shaiju C.K.
You are right! Thanks for pointing it out. The sixth option should have read "A clustered index exists ..." instead of "No clustered index exists ..."
I have edited my post to prevent future confusion.
Hugo Kornelis, SQL Server MVP
Visit my SQL Server blog:
http://sqlblog.com/blogs/hugo_kornelis
Post #894481
parthenitin
parthenitin
Posted Saturday, April 03, 2010 2:39 AM
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Last Login: Friday, February 15, 2013 5:28 AM
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When we creates the primary key it alwas enforce to create as Clustured.
how it will enforce to create as NonClustered.
Please Can u tell me.
Post #896178
Paul White
Paul White
Posted Saturday, April 03, 2010 2:53 AM
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parthenitin (4/3/2010)
When we creates the primary key it alwas enforce to create as Clustured.
how it will enforce to create as NonClustered.
Please Can u tell me.
Use the NONCLUSTERED keyword.
See
Creating and Modifying PRIMARY KEY Constraints
Example:
DECLARE @Table
TABLE (
column1 INTEGER NOT NULL
PRIMARY KEY NONCLUSTERED
);
Paul White
SQL Server MVP
SQLblog.com
@SQL_Kiwi
Post #896181
Hugo Kornelis
Hugo Kornelis
Posted Saturday, April 03, 2010 6:29 AM
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parthenitin (4/3/2010)
When we creates the primary key it alwas enforce to create as Clustured.
how it will enforce to create as NonClustered.
Please Can u tell me.
In addition to the reply by Paul -- if there is already a clutered index on the table, then the index for the primary key will also default to nonclustered.
Hugo Kornelis, SQL Server MVP
Visit my SQL Server blog:
http://sqlblog.com/blogs/hugo_kornelis
Post #896218
Kimberly L. Tripp
Kimberly L. Tripp
Posted Sunday, April 04, 2010 2:21 PM
SSC Rookie
Group: General Forum Members
Last Login: Thursday, May 02, 2013 9:26 AM
Points: 27,
Visits: 44
Thanks Hugo. That was the main one (and point) I was making.
Often people use scripts to create objects but there are strange cases where multiple developers working on the same project creates... er... "issues" and the indexes aren't quite as consistent as expected. Constraints are often created via scripts but often as standalone scripts (not always as part of the table's create) and sometimes problems can occur when there are too many cooks in the kitchen.
Cheers!
Kimberly L. Tripp
SQL Server MVP, Microsoft Regional Director
blog: www.SQLskills.com/blogs/Kimberly
twitter: www.twitter.com/KimberlyLTripp
Post #896469
khullargirish02
khullargirish02
Posted Friday, May 27, 2011 3:54 AM
Old Hand
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Last Login: Monday, February 18, 2013 10:54 PM
Points: 371,
Visits: 110
False, if a clustered index already exists, DB will enforce the Primary Key constraint with a nonclustered index
Post #1116092
khullargirish02
khullargirish02
Posted Friday, May 27, 2011 3:55 AM
Old Hand
Group: General Forum Members
Last Login: Monday, February 18, 2013 10:54 PM
Points: 371,
Visits: 110
if a clustered index already exists, SQL Server will enforce the Primary Key constraint with a nonclustered index
Post #1116093
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