|PostgreSQL 8.4.19 Documentation|
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btree_gist provides sample GiST operator classes that implement B-Tree equivalent behavior for the data types int2, int4, int8, float4, float8, numeric, timestamp with time zone, timestamp without time zone, time with time zone, time without time zone, date, interval, oid, money, char, varchar, text, bytea, bit, varbit, macaddr, inet, and cidr.
In general, these operator classes will not outperform the equivalent standard btree index methods, and they lack one major feature of the standard btree code: the ability to enforce uniqueness. However, they are useful for GiST testing and as a base for developing other GiST operator classes.
CREATE TABLE test (a int4); -- create index CREATE INDEX testidx ON test USING gist (a); -- query SELECT * FROM test WHERE a < 10;