&
Bitwise AND. Converts the values to binary and compares bits. Only if both the corresponding bits are 1 is the resulting bit also 1.
See also bitwise OR.
SELECT 2&1; +-----+ | 2&1 | +-----+ | 0 | +-----+ SELECT 3&1; +-----+ | 3&1 | +-----+ | 1 | +-----+ SELECT 29 & 15; +---------+ | 29 & 15 | +---------+ | 13 | +---------+
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https://mariadb.com/kb/en/bitwise_and/