Adam Witney <[EMAIL PROTECTED]> writes:
> bugasbase2=# SELECT bioassay_id, count(*) from mba_data_base where
> bioassay_id = 5153 group by bioassay_id;
>  bioassay_id | count
> -------------+-------
>         5153 | 20000
>         9712 |   120

That's pretty interesting :-(.  What PG version is this?  Is there an
index on bioassay_id, and if so is the query using it?  REINDEXing
the index might fix it.

                        regards, tom lane

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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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