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Home -> Community -> Usenet -> c.d.o.misc -> Re: SQL in constraints II

Re: SQL in constraints II

From: Terry Dykstra <tdykstra_at_cfol.ab.ca>
Date: Thu, 4 Mar 1999 12:37:28 -0700
Message-ID: <36dee0e9.0@news.cadvision.com> 





The trigger will work, but it takes some time to work around the 'mutating
table' error.  I've included an example insert trigger from of our tables,
that more or less does what you are trying to achieve.



--


Terry Dykstra


Canadian Forest Oil Ltd.


Mark Gumbs wrote in message <36deb62a.0_at_145.227.194.253>...


>We have a table with a date range on it i.e. start and end dates.  We want


>to make sure that for any particular person (EMPNO???) that the date ranges


>entered do not overlap those of any existing records.


>


>How best to implement this?


>


>We thought


>


>a)    constraint, but you can't put SQL in it.


>b)    database trigger.  This would give us a mutating table though, we


>suspect as we need to query the table being inserted (or updated) into.


>c)    application (Forms) code.  This will work but we'd like the extra


>safety net of testing at the server level also.


>


>Any ideas anyone?


>


>Alan


>


>






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`


end

Received on Thu Mar 04 1999 - 13:37:28 CST












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