null_or_empty

null_or_empty

description

Syntax

BOOLEAN NULL_OR_EMPTY (VARCHAR str)

It returns true if the string is an empty string or NULL. Otherwise it returns false.

example

MySQL [(none)]> select null_or_empty(null);
+---------------------+
| null_or_empty(NULL) |
+---------------------+
|                   1 |
+---------------------+

MySQL [(none)]> select null_or_empty("");
+-------------------+
| null_or_empty('') |
+-------------------+
|                 1 |
+-------------------+

MySQL [(none)]> select null_or_empty("a");
+--------------------+
| null_or_empty('a') |
+--------------------+
|                  0 |
+--------------------+

keywords

NULL_OR_EMPTY