> is there a way to tell Postgres which index to use when a query is
> issued in 7.4.2?

PostgreSQL adjusts usage through global parameters, statistics, and periodic 
ANALYZE.   Please post an EXPLAIN ANALYZE (not just EXPLAIN) for your query 
and people on this list can help you with your specific problem.

Josh Berkus
Aglio Database Solutions
San Francisco

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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

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