Hamming distance function for PostgreSQL¶ ↑

Computes the hamming distance for 2 64bit unsigned integers.

Requirements¶ ↑

PostgreSQL Server development libraries. (debian: postgresql-server-dev-9.0 e.g.)
pg_config in PATH.
GNU C compiler.
GNU make.

PSQL_DB=<database name> make install

select hamming_distance(4, 3); #=> 3