Seth Robertson wrote:
In order to support some automation, I needed the ability to pull out
subsets of postgres tables in a format which could be loaded into
other postgres databases.


One alternative would be using CREATE TABLE AS to create a separate table containing the desired subset, and then using pg_dump to dump that table.

Instead of writing a utility to replicate the functionality in
pg_dump, I created a new flag, --where, which allows you to postpend
where (or order or limit or whatever) sql fragments at the end of the
select done by pg_dump.

Neat, but IMHO too much of a kludge for mainline.

-Neil

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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not
      match

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