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Discuss content posted by Nakul Vachhrajani
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Fun with IDENTITY - Part I
19 posts, Page 2 of 2
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Fun with IDENTITY - Part I
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SQLRNNR
SQLRNNR
Posted Wednesday, September 29, 2010 4:40 AM
SSCoach
Group: General Forum Members
Last Login: Today @ 12:32 AM
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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 #995065
Mike Is Here
Mike Is Here
Posted Wednesday, September 29, 2010 6:02 AM
Ten Centuries
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UMG Developer (9/28/2010)
I agree, nice question, but it would have been even better with a fourth option: 1-Boston;2-New Delhi
Without that option it was really a test of transactions, not of IDENTITY. (Maybe that was the point to through people off the scent?)
Agreed, reading the question I was thinking would New Delhi be 2 or 3. When 2 was not an option that answer was clear.
Post #995111
sjimmo
sjimmo
Posted Wednesday, September 29, 2010 6:06 AM
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Good question - after the fun with transactions, nobody should have gotten this one wrong
Steve Jimmo
Sr DBA
“If we ever forget that we are One Nation Under God, then we will be a Nation gone under." - Ronald Reagan
Post #995115
SanjayAttray
SanjayAttray
Posted Wednesday, September 29, 2010 8:17 AM
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Easy one. With Begin and Rollback Transaction included in question it's easy to select correct answer.
SQL DBA.
Post #995264
Daniel Bowlin
Daniel Bowlin
Posted Wednesday, September 29, 2010 8:23 AM
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It's nice to get a QoTD once in a while without a trick. Nice question.
Post #995277
daveb87
daveb87
Posted Wednesday, September 29, 2010 9:27 AM
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I agree, a forth option of 1-Boston;2-New Delhi would have made the question better. With a forth option, I would have had to think more about the impact of a rolled back transaction has on the Identity values to get the correct answer.
Good question though.
Post #995364
Toreador
Toreador
Posted Thursday, September 30, 2010 6:28 AM
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edit - replied to the wrong topic!
Post #995862
Amy.G
Amy.G
Posted Friday, October 01, 2010 9:24 AM
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Why would you ever use "rollback transaction" unless with an "if @@error" statement?
Post #996773
L' Eomot Inversé
L' Eomot Inversé
Posted Friday, October 01, 2010 11:28 AM
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The correct answer "It depends" isn't available as an option.
How many rows are produced depends on the IMPLICIT_TRANSACTIONS setting.
If ANSI_DEFAULTS or IMPLICIT_TRANSACTIONS have been set on, this code will produce no rows (just an error message for the third insert, which is an attempt to insert into a nonexistent table). The BEGIN TRAN statement won't open a transaction because there is already an active transaction.
But most connections default to autocommit mode ( so IMPLICIT_TRANSACTIONS is off) so the code will produce 2 rows, as in the supposedly correct answer.
As no rows wasn't an option, it was possible to deduce that IMPLICIT_TRANSACTIONS had to be OFF so that the 2-row answer was the one expected by the person who set the question.
Tom
Is minic a gheibheann béal oscailte dorn dúnta.
Is minig a cheapas beul fosgailte dòrn dùinte.
http://es.linkedin.com/in/tomthomsonsoftware
Post #996872
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