If N_or_S is a number, returns a string representation of the hexadecimal value of N.
If N_or_S is a string, returns a hexadecimal string representation of N_or_S where each character in N_or_S is converted to two hexadecimal digits.
mysql>mysql> SELECT HEX(255);+----------+| HEX(255) |+----------+| FF |+----------+1 row in set (0.00 sec)mysql>
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