Home Database Mysql Tutorial What happens if we provide NULL as a parameter to the MySQL CHAR() function?

What happens if we provide NULL as a parameter to the MySQL CHAR() function?

Sep 09, 2023 am 08:01 AM

如果我们提供 NULL 作为 MySQL CHAR() 函数的参数,会发生什么?

The MySQL CHAR() function ignores NULL if NULL is provided as a parameter. To understand it, consider the following example -

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mysql> Select CHAR(65,66,67,NULL);

+---------------------+

| CHAR(65,66,67,NULL) |

+---------------------+

| ABC                 |

+---------------------+

1 row in set (0.00 sec)

 

mysql> Select CHAR(NULL,66,67,NULL);

+-----------------------+

| CHAR(NULL,66,67,NULL) |

+-----------------------+

| BC                    |

+-----------------------+

1 row in set (0.00 sec)

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In both the above examples, the CHAR() function ignores NULL and converts the numeric value to a character value.

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