MySQL Tutorial/Math Numeric Functions/BIT OR
BIT_OR(expr): Returns the bitwise OR of all bits in expr.
The calculation is performed with 64-bit (BIGINT) precision.
This function returns 0 if there were no matching rows.
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mysql> mysql> mysql> select BIT_OR(1); +-----------+ | BIT_OR(1) | +-----------+ | 1 | +-----------+ 1 row in set (0.00 sec)</source>