From: http://www.postgresql.org/docs/8.2/interactive/datatype-
numeric.html#DATATYPE-INT
The type integer is the usual choice, as it offers the best balance
between range, storage size, and performance. The smallint type is
generally only used if disk space is at a premium. The bigint type
should only be used if the integer range is not sufficient, because
the latter is definitely faster.
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