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Triggers 2


Triggers 2

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sestell1
sestell1
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I was surprised this was your question Hugo. I didn't think it was yours when I saw the Count(*) in the trigger! ;-)
Lon-860191
Lon-860191
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Great question, another correction to allow it to work is changing "= 1" to "> 0", obviously without the quotes included.
Thanks,
Lon
DBA by default
DBA by default
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Good question. The code was easier to follow than most lately. Thanks.
Miles Neale
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Nice +1.

Not all gray hairs are Dinosaurs!
SQLRNNR
SQLRNNR
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Thanks Hugo.



Jason AKA CirqueDeSQLeil
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Revenant
Revenant
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Very, very nice. Thank you, Hugo!
Rob Schripsema
Rob Schripsema
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Great question, Hugo. Thanks.

Rob Schripsema
Propack, Inc.
Tom Thomson
Tom Thomson
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Hugo Kornelis (4/25/2013)
L' Eomot Inversé (4/25/2013)
But I have a minor quibble: if this is a business rule, it should be enforced by the schema if possible, not by code; and this is a classic example of a rule that can be enforced by a check constraint.

For a production implementation, I fully agree that a trigger, even a well-coded one, would be a terrible way to implement this rule.
I was pretty sure you would:-P

But for a QotD about triggers, using a CHECK constraint would not have been a very smart choice! ;-)

And there's the challenge to ingenuity: devise a rule which can't be implemented as a check constraint (or any other sort of constraint) and therefor has to be implemented as a trigger (because ad hoc updates and inserts and deletes are allowed, so a trigger is the only way you can be sure of executing the code when needed) while at the same time the rule and the trigger are sufficiently non-complex to make a good QotD. I think that might be very difficult, depending on where the commplexity limit is.

Tom

pchirags
pchirags
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Awesome question..
Thanks..
Bangla
Bangla
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Nice question Hugo...
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