在这种情况下，ASCII()函数的输出取决于我们是否将NULL作为字符串提供，还是仅仅提供NULL。以下示例将演示区别−
mysql> SELECT ASCII(null);+-------------+| ASCII(null) |+-------------+| NULL |+-------------+1 row in set (0.00 sec)mysql> SELECT ASCII('null');+---------------+| ASCII('null') |+---------------+| 110 |+---------------+1 row in set (0.00 sec)mysql> Select ASCII(NULL);+-------------+| ASCII(NULL) |+-------------+| NULL |+-------------+1 row in set (0.00 sec)mysql> Select ASCII('NULL');+---------------+| ASCII('NULL') |+---------------+| 78 |+---------------+1 row in set (0.00 sec)
As we can observe from the above result set that when we will provide NULL or null as a string, ASCII() function will return the number code of the first character i.e. number code of N in case of ‘NULL’ and number code of n in case of ‘null’, otherwise when we provide simply NULL then it returns NULL as output.
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