What will the MySQL CHAR_LENGTH() function return if no arguments are provided?

In this case, it means that we provide an empty string as an argument to the CHAR_LENGTH() function. If an empty string is supplied, it returns 0 because the CHAR_LENGTH() function has no characters to count.

Example

mysql> Select CHAR_LENGTH('');
+-----------------+
| CHAR_LENGTH('') |
+-----------------+
| 0               |
+-----------------+
1 row in set (0.00 sec)

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