Using UPDATE()

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Using UPDATE()

Steve Jones - SSC Editor

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Points: 734434
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August 16, 2018 at 9:31 pm

#100982

Comments posted to this topic are about the item Using UPDATE()

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Stewart "Arturius" Campbell SSC Guru Points: 72497 More actions · Answer 1

Nice question to end the week on, thanks, Steve

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Shayn Thomas SSCertifiable Points: 5863 More actions · Answer 2

got it wrong but learnt something new,
cheers Steve

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Jeff Moden SSC Guru Points: 1003859 More actions · Answer 3

Heh... this will make a good, quick ice-breaker question for interviews like the "How do you get the current date and time in T-SQL". Litmus strips anyone? 😀

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

TomThomson SSC Guru Points: 104773 More actions · Answer 4

Jeff Moden - Friday, August 17, 2018 7:42 AM
Heh... this will make a good, quick ice-breaker question for interviews like the "How do you get the current date and time in T-SQL". Litmus strips anyone? 😀

Well, the real answer is of course "only in some kinds of trigger". The UPDATE() function can't be used in DDL triggers, or in Logon triggers, or in INSERT triggers - only in DELETE and UPDATE (DML) triggers - so there are more kinds of trigger that it can't be used in than kinds that it can be used in.

Tom

Jeff Moden SSC Guru Points: 1003859 More actions · Answer 5

TomThomson - Friday, August 17, 2018 8:11 AM
Jeff Moden - Friday, August 17, 2018 7:42 AM
Heh... this will make a good, quick ice-breaker question for interviews like the "How do you get the current date and time in T-SQL". Litmus strips anyone? 😀
Well, the real answer is of course "only in some kinds of trigger". The UPDATE() function can't be used in DDL triggers, or in Logon triggers, or in INSERT triggers - only in DELETE and UPDATE (DML) triggers - so there are more kinds of trigger that it can't be used in than kinds that it can be used in.

True enough but I'm shooting really low here... There have been many resumes I've been through where the candidate claims that they've written triggers but then can't tell me a thing about what the INSERTED or DELETED logical tables actually are. Asking about UPDATE() is a nice short question that will allow me to quickly determine how full the candidate's ditty bag might actually be... or not. 😀 Again, "Litmus Strip". If they know their stuff, I would expect them to follow up with a bit more information like what you just said.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Steve Jones - SSC Editor SSC Guru Points: 734434 More actions · Answer 6

Jeff Moden - Friday, August 17, 2018 7:42 AM
Heh... this will make a good, quick ice-breaker question for interviews like the "How do you get the current date and time in T-SQL". Litmus strips anyone? 😀

For sure

dstrickrott SSCommitted Points: 1951 More actions · Answer 7

dstrickrott

SSCommitted

Points: 1951

August 17, 2018 at 1:33 pm

#2002319

Nice question for a Friday. Thanks Steve.