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Bitwise OR. Converts the values to binary and compares bits. If either of the corresponding bits has a value of 1, the resulting bit is also 1.
See also bitwise AND.
SELECT 2|1; +-----+ | 2|1 | +-----+ | 3 | +-----+ SELECT 29 | 15; +---------+ | 29 | 15 | +---------+ | 31 | +---------+
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https://mariadb.com/kb/en/bitwise-or/