Scott Ribe <scott_ribe@killerbytes.com> writes:
>> name | state | from_date | to_date
>> ------------------------------------
>> foo | state2 | <date> | <date>
>> foo | state1 | <date> | <date>
>> bar | state4 | <date> | <date>
>> ...
>> foo | state3 | <date> | <date>
>
> I would consider using only 1 table, where a NULL to_date indicates the
> current state, and you have a compound index on (name, to_date) to support
> querying for current state. Perhaps you could use a partial index as well to
> speed up those queries, but I haven't yet explored that feature of
> PostgreSQL.
Well.. There is already several indexes (choosed accordingly to
performance test). And, also, table current contains some fields not
found in history, so only 1 table for both type of information is not
ideal.
--
Frédéric Jolliton