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Posted by Hugo Kornelis on 11/08/07 21:58
On Thu, 08 Nov 2007 07:29:06 -0800, Nick wrote:
>I have have 3 tables TableA, TableB and TableC. TableA holds the keys
>to TableB and TableC. I need a query which will display the details
>from TableB and TableC depending on the key in TableA.
>
>For eg.
>
>TableA - columns {id, relatedkey, recordType} ===recordType will hold
>values like TableB or TableC
>TableB - columns{id, column1}
>TableC - columns{id, column1}
>
>the query should match the related key to the id of TableA or table B
>based on recordType and show the column1 value with the TabelA id so
>output for this should be
>
>
>id recordType column1
>
>1 TableB value of TableB column1
>2 TableC value of TableC column1
>
>Please help.
Hi Nick,
The solution jhofmeyr posted will work for you. But I think you should
question your design. If TableB and TableC are actually the same thing,
they should be a single table. And if they are different things, then
TableA should have two referencing columns plus a CHECK constraint to
ensure that mey not both be NOT NULL.
--
Hugo Kornelis, SQL Server MVP
My SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis
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