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What MySQL ASCII() function returns if I will provide NULL to it?
In this case, the output of ASCII() function depends on the condition that whether we are providing NULL as a string or we are providing simply NULL to it. Following example will demonstrate the difference −
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.
Updated on: 30-Jan-2020
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