On Tue, Oct 26, 2004 at 16:23:20 -0400,
Wei Weng <[EMAIL PROTECTED]> wrote:
> In the following query
>
> SELECT Parent FROM Channels ORDER BY Parent ASC;
>
> If I have a couple of (NULL)s in the field [Parent], they will be listed at
> the bottom of the query result.
>
> Is it because PostgreSQL considers (NULL) as the biggest value? If I run
> the same query under MSSQL Server 2000, I get the exact opposite result
> regarding the order of (NULL)s and (non-NULL) values. They are listed at
> the very beginning of the query result.
If the order matters, you can order by IS NULL or IS NOT NULL.
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
