Complex foreign key

Question

Complex foreign key

Carlo Romagnano

SSC-Insane

Points: 22597
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September 21, 2016 at 11:19 pm

#400761

Comments posted to this topic are about the item Complex foreign key
September 22, 2016 at 11:24 pm

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Toreador SSChampion Points: 11358 More actions · Answer 1

Took me a while to work this out, as I thought the lower-case l for the first column was a number 1. Would have been better with different column names!

After this it was clear that master would be created, so it was just a question of working out the only combination of 3 other options that weren't mutually contradictory.

Carlo Romagnano SSC-Insane Points: 22597 More actions · Answer 2

When I posted the qotd, all names were lower case. I don't know who capitalized them.

My instance of sqlserver has the binary collation.

GaryV Hall of Fame Points: 3307 More actions · Answer 3

I suppose giving the full message rather than "etc" would have given it away.

George Vobr SSCrazy Eights Points: 9914 More actions · Answer 4

An interesting QotD, but it was necessary to proceed slowly and cautiously to find the right answers...:hehe:

Thanks Carlo for thoughtfully prepared question and good references.

Aaron N. Cutshall SSCrazy Eights Points: 8992 More actions · Answer 5

I got the responses correct except that I also included "Command(s) completed successfully." -- which does flash briefly due to the master table creating successfully (doing them individually shows that as well).

Oh well....

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Carlo Romagnano SSC-Insane Points: 22597 More actions · Answer 6

Aaron N. Cutshall (9/22/2016)
I got the responses correct except that I also included "Command(s) completed successfully." -- which does flash briefly due to the master table creating successfully (doing them individually shows that as well).
Oh well....

The batch is only one! "Command(s) completed successfully." appears only if the entire batch runs without errors.

TomThomson SSC Guru Points: 104773 More actions · Answer 7

Good interesting question.

I rather dislike SQL Server's lumping together of multiple cascade paths and cascade cycles; it shouldn't be forcing us to use triggers in all cases where there can be multiple cascade paths. I'm perfectly happy for it to refuse to handle cascade cycles because I think a that it's potentially possible to obtain different results according to what order updates and/or deletions take place, but I would prefer to see it hadling multiple cycle-free cascade in cases where it's easy to detect (from the metadata) that different resuts can't be produced by different operation orders (as in the example in this case).

Tom

Aaron N. Cutshall SSCrazy Eights Points: 8992 More actions · Answer 8

Carlo Romagnano (9/22/2016)
Aaron N. Cutshall (9/22/2016)
I got the responses correct except that I also included "Command(s) completed successfully." -- which does flash briefly due to the master table creating successfully (doing them individually shows that as well).
Oh well....
The batch is only one! "Command(s) completed successfully." appears only if the entire batch runs without errors.

Good point. Since batch is what was mentioned in the QotD, that's what I should rely on. And, upon further reflection, I think the message I saw flash was simply that the table was created.

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Revenant SSC-Forever Points: 42467 More actions · Answer 9

Revenant

SSC-Forever

Points: 42467

September 22, 2016 at 9:31 am

#1902512

Really interesting question. Thanks, Carlo!

Junior Galvão - MVP SSCertifiable Points: 6884 More actions · Answer 10

Aaron N. Cutshall,

I agree with you.

I have not received the incorrect syntax message, anyway I gocheck syntax with button parse and received the message Command(s) completed successfully.

😀

Steve Jones - SSC Editor SSC Guru Points: 734418 More actions · Answer 11

Carlo Romagnano (9/22/2016)
When I posted the qotd, all names were lower case. I don't know who capitalized them.
My instance of sqlserver has the binary collation.

We reformat code to highlight keywords.

Sean Lange SSC Guru Points: 286573 More actions · Answer 12

I knew the answer but for the life of me I couldn't figure out why I needed to choose 4 answers. For some reason my brain did not understand that all the answers were about logical problems but one was about syntax. Good question but the one answer really threw me off.

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Rune Bivrin SSCrazy Eights Points: 8438 More actions · Answer 13

Good question, but a small nit-pick:

"The syntax of the batch is correct" is not really an output of the batch, but the conclusion of the parser. That message doesn't appear anywhere.

Just because you're right doesn't mean everybody else is wrong.