| From: | Richard Huxton <dev(at)archonet(dot)com> |
|---|---|
| To: | Mark Collette <mark(at)hyperbyte(dot)ab(dot)ca> |
| Cc: | pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: Updating column to link one table to another |
| Date: | 2004-12-20 09:13:28 |
| Message-ID: | 41C697B8.9030700@archonet.com |
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| Lists: | pgsql-sql |
Mark Collette wrote:
>
> Now, I've added the infrequentId columns to both, as an optimization, so
> that I can quickly find the InfrequentTable entry for a given
> FrequentTable entry. I've done this because I want to speed up
> SELECTs. Any new INSERTs are working just fine. But, all my legacy
> entries, are not linked up yet. I need to know how I can UPDATE the
> FrequentTable rows, where their infrequentId is zero, to point at the
> last InfrequentTable entry whose timestamp ts is before its own
> timestamp ts.
How do you distinguish between InfrequentTable entries when their
timestamp is the same?
--
Richard Huxton
Archonet Ltd
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