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Posted by joeNOSPAM@BEA.com on 01/09/07 18:30
On Jan 6, 2:37 pm, "John Rivers" <firs...@btinternet.com> wrote:
> create from dbo.fromExample
> as
> from dbo.Customers c
> join dbo.Invoices i
> on c.CustomerID = i.CustomerID
>
> now you can use it as follows:
>
> select c.CustomerID, i.InvoiceNo
> from dbo.fromExample
>
> I find I reuse FROM clauses alot
>
> and reusing a "base query" requires writing a very large and cumbersome
> select clause
You essentially want a new step in parsing SQL, and a function that
substitutes a long string into the SQL for your before it's really
parsed.
The DBMS can't supply anything fancier because the actual semantics
and the effect on the query plan of any FROM clause are essentially
unbounded. This would be better done somewhere in the client.
Joe Weinstein at BEA Systems
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