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Invert all bits. This unary operator flips every bit in the operand, changing 1s to 0s and 0s to 1s.
~
Bitwise NOT. Converts the value to 4 bytes binary and inverts all bits.
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SELECT 3 & ~1; +--------+ | 3 & ~1 | +--------+ | 2 | +--------+ SELECT 5 & ~1; +--------+ | 5 & ~1 | +--------+ | 4 | +--------+