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Thomas LeBlanc SSCrazy Eights Points: 8085 More actions · Answer 1

CASCADE was added in SQL Server 2000.

I remeber because in SQL Server 7.0, I wrote triggers to cascade update and delete on 100+ tables in a database, and 3 months later when we upgraded to 2000, casecade was available on foreign key constraints.

Thomas LeBlanc, MVP Data Platform Consultant

Konstantin Reu Hall of Fame Points: 3149 More actions · Answer 2

One more time stupid question... Does anybody make review before its became published ? Also it would be nice to have possibility dismiss results for this one.

MS SQL 2008 MCITP x 3
MS SQL 2012 MCSE x 2

Julie Hall of Fame Points: 3292 More actions · Answer 3

Well, I thought this was an easy question, until I read the comments.

Ron McCullough SSC Guru Points: 63877 More actions · Answer 4

Rather late in getting around to attempt to answer this particular QOD and

Correct answers: .. 30% (164)

Incorrect answers: 70% (376)

Total attempts: 540

[Rant]

IMHO the discussion of CASCADE options has certainly increased the benefit of the QOD for those who have read the discussion (comments), other than that, this particular QOD would be a GREAT example of what is NOT an acceptable submittal.

[/Rant]

If everything seems to be going well, you have obviously overlooked something.

Ron

Please help us, help you -before posting a question please read[/url]
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mtassin SSC-Insane Points: 23099 More actions · Answer 5

Koen Verbeeck (11/30/2012)
Got it wrong because you can update or delete rows in the primary tables if you specify ON CASCADE options.
Next time do more homework please.

I completely concur

On CASCADE handles the first "correct answer". We can delete a row from the primary table if there is ON CASCADE settings in place to handle it.

Can delete a row from primary table if there are related rows in secondary table,

And if the Foreign Key column is Nullable, you can certainly insert rows that are not related to the primary table.

Can insert a new row in secondary table if there are not related rows in primary table

--Mark Tassin
MCITP - SQL Server DBA
Proud member of the Anti-RBAR alliance.
For help with Performance click this link[/url]
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mtassin SSC-Insane Points: 23099 More actions · Answer 6

dineshbabus (11/30/2012)
I think he is expecting us to think in normal scenario.. We shud not think beyond that..

My normal scenarios include Nullable foreign keys and DELETE CASCADE options.

--Mark Tassin
MCITP - SQL Server DBA
Proud member of the Anti-RBAR alliance.
For help with Performance click this link[/url]
For tips on how to post your problems[/url]

mtassin SSC-Insane Points: 23099 More actions · Answer 7

Koen Verbeeck (11/30/2012)
dineshbabus (11/30/2012)
How come you are saying Cascade is normal on update/delete. By default it will be No Action rite?
Yes. But changing it is also normal.
Just because the default prevents something, doesn't mean it cannot be done at all.

And columns when they are created unless NOT NULL is specified on a default install of SQL are nullable. So Nullable Foreign keys are the default 🙂

--Mark Tassin
MCITP - SQL Server DBA
Proud member of the Anti-RBAR alliance.
For help with Performance click this link[/url]
For tips on how to post your problems[/url]

mtassin SSC-Insane Points: 23099 More actions · Answer 8

Hugo Kornelis (11/30/2012)
Tom, I also have been trying to find when cascading referential integrity was introduced. Like you, I could not find anything conclusive, but I might very well have been SQL 2000.

~~I'm pretty sure I remember using it in SQL 7.0~~, which was my first version of SQL I used in production. Spent a good 6 years using it too until the ERP we were using got upgraded to a version that supported SQL 2000. 6 months before the release of SQL 2005.

Guess I'm getting old enough to confuse 2000 with 7. Perhaps it was triggers I used to mimic it. In either case it's been almost 8 years since I've seen 7.0 so who am I to argue? 🙂

--Mark Tassin
MCITP - SQL Server DBA
Proud member of the Anti-RBAR alliance.
For help with Performance click this link[/url]
For tips on how to post your problems[/url]

Lon-860191 SSCrazy Points: 2449 More actions · Answer 9

Good question if only I had read the "not", oh well.

Thanks,

Lon

SQLRNNR SSC Guru Points: 281334 More actions · Answer 10

Thanks for the question.

Jason...AKA CirqueDeSQLeil
_______________________________________________
I have given a name to my pain...MCM SQL Server, MVP
SQL RNNR
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Jamsheer Ten Centuries Points: 1136 More actions · Answer 11

Saramilla.. Author oru paavamanu.. leave it.. Avanu vendi njan maapu chodikunnu.

hakim.ali SSCarpal Tunnel Points: 4239 More actions · Answer 12

Jamsheer (12/4/2012)
Saramilla.. Author oru paavamanu.. leave it.. Avanu vendi njan maapu chodikunnu.

Isn't the very point of posting on a forum so that you can share your thoughts with others? No idea what language this is in, but I doubt most people on this forum know it.

Hakim Ali
www.sqlzen.com

(Bob Brown) SSCrazy Points: 2705 More actions · Answer 13

hakim.ali (12/4/2012)
Jamsheer (12/4/2012)
Saramilla.. Author oru paavamanu.. leave it.. Avanu vendi njan maapu chodikunnu.
Isn't the very point of posting on a forum so that you can share your thoughts with others? No idea what language this is in, but I doubt most people on this forum know it.

I'm with you Akim.

jts2013 Hall of Fame Points: 3226 More actions · Answer 14

I think I just got confused by the double negative aspect of the question -which statement is NOT true and the statement are full of Can and Cant - should have taken a bit longer to think them all through! 😀

odepriester SSC Enthusiast Points: 184 More actions · Answer 15

Just went wrong due to the NULL value possibilty. 🙁

Some projects have already failed with such a lack of precision ... :w00t: