6.7. Bitwise Functions

• bitcount(_x, bits) → bigint
• Count the number of bits set in x (treated as bits-bit signedinteger) in 2’s complement representation:

SELECT bit_count(9, 64); -- 2
SELECT bit_count(9, 8); -- 2
SELECT bit_count(-7, 64); -- 62
SELECT bit_count(-7, 8); -- 6

• bitwiseand(_x, y) → bigint

• Returns the bitwise AND of x and y in 2’s complement representation.

• bitwisenot(_x) → bigint

• Returns the bitwise NOT of x in 2’s complement representation.

• bitwiseor(_x, y) → bigint

• Returns the bitwise OR of x and y in 2’s complement representation.

• bitwisexor(_x, y) → bigint

• Returns the bitwise XOR of x and y in 2’s complement representation.

• bitwiseshift_left(_x, shift, bits) → bigint

• Left shift operation on x (treated as bits-bit integer)shifted by shift.

SELECT bitwise_shift_left(7, 2, 4); – 12SELECT bitwise_shift_left(7, 2, 64); – 28

• bitwiselogical_shift_right(_x, shift, bits) → bigint
• Logical right shift operation on x (treated as bits-bit integer)shifted by shift.

SELECT bitwise_logical_shift_right(7, 2, 4); – 1SELECT bitwise_logical_shift_right(-8, 2, 5); – 6

• bitwisearithmetic_shift_right(_x, shift) → bigint
• Arithmetic right shift operation on x shifted by shift in 2’s complement representation.

SELECT bitwise_arithmetic_shift_right(-8, 2); – -2SELECT bitwise_arithmetic_shift_right(7, 2); – 1

See also bitwise_and_agg() and bitwise_or_agg().