Returns 0 if str is the empty string.
Returns NULL if str is NULL.
ASCII() works for characters with numeric values from 0 to 255.
mysql>mysql> SELECT ASCII('2');+------------+| ASCII('2') |+------------+| 50 |+------------+1 row in set (0.00 sec)mysql> SELECT ASCII(2);+----------+| ASCII(2) |+----------+| 50 |+----------+1 row in set (0.00 sec)mysql>mysql>
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