Groups > microsoft.public.sqlserver.programming > #31349

Re: Indexing for View Containing UNION

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From	Erland Sommarskog <esquel@sommarskog.se>
Newsgroups	microsoft.public.sqlserver.programming
Subject	Re: Indexing for View Containing UNION
Date	Tue, 25 Jun 2019 21:05:39 +0200
Organization	Erland Sommarskog
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Michael Cole (micheal.cole@invalid.com) writes:
> The intent is "C" is not an actual owner - that all the records with 
> "C" as their owner are effectively shared for all other owners, and 
> this we need to ensure uniqueness of ownership based on the query in 
> the view, e.g., any "owned" items can not be the same as a "shared" 
> item.  Issue is that I cannot put a PK on the view as it contains the 
> UNION.I cannot change the data structure, but any suggestions as to how 
> I could implement such a constraint would be welcome.
> 

Not only is the UNION preventing you indexed view, the subquery does too, 
and I don't thinkt the CROSS APPLY is good.

I think you will need to use triggers to enforce this.

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Indexing for View Containing UNION Michael Cole <micheal.cole@invalid.com> - 2019-06-24 18:05 +1000
  Re: Indexing for View Containing UNION Erland Sommarskog <esquel@sommarskog.se> - 2019-06-25 21:05 +0200

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