Unfortunately, no. I'm working on the application development side;
the "real" DBAs are in another department and the usual turf-protection
attitudes apply.
- "Mohan, Ross" <MohanR_at_STARS-SMI.com> wrote:
> don't suppose you can properly
> normalize the tables through
> materialized views and update
> the "pk" through that, eh?
>
> -----Original Message-----
> Sent: Thursday, November 01, 2001 3:56 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Given a business rule that says a combination of three columns must
> be
> unique if and only if a fourth column equals a certain value, and if
> the table in question contains rows that violate this requirement,
> I'm
> trying to write a single SQL statement that will remove the
> duplicates.
> Of each set of duplicate rows, I'll delete the one with the latest
> insert timestamp.
>
> Let's call the columns
>
> a b c d timestamp
>
> The combination of b, c, and d must be unique if a = 2.
>
> I can get the duplicate row values along with the latest timestamp
> via
>
> select max(tstamp), a, b, c from
> my_table group by a, b, c having count(*) > 1
>
> But I can't figure out how to use that in a delete statement.
>
> Suggestions greatly appreciated!
>
>
> Paul Baumgartel
>
>
> __________________________________________________
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> INET: treegarden_at_yahoo.com
>
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> Author: Mohan, Ross
> INET: MohanR_at_STARS-SMI.com
>
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INET: treegarden_at_yahoo.com
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Received on Fri Nov 02 2001 - 08:42:25 CST
