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Triggers 2 Expand / Collapse
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Posted Thursday, April 25, 2013 7:00 AM


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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!
Post #1446471
Posted Thursday, April 25, 2013 8:21 AM
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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
Post #1446535
Posted Thursday, April 25, 2013 8:45 AM
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Good question. The code was easier to follow than most lately. Thanks.
Post #1446547
Posted Thursday, April 25, 2013 9:30 AM
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Nice +1.

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Post #1446570
Posted Thursday, April 25, 2013 9:49 AM


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Thanks Hugo.



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Post #1446581
Posted Thursday, April 25, 2013 10:07 AM


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Very, very nice. Thank you, Hugo!
Post #1446599
Posted Thursday, April 25, 2013 11:23 AM


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Great question, Hugo. Thanks.


Rob Schripsema
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Post #1446646
Posted Thursday, April 25, 2013 12:31 PM


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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

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
Post #1446669
Posted Thursday, April 25, 2013 7:46 PM


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Awesome question..
Thanks..
Post #1446770
Posted Friday, April 26, 2013 3:52 AM
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Nice question Hugo...
Post #1446883
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