array_length
Description
Returns the number of elements in an array. The result type is INT. If the input parameter is NULL, the result is also NULL. Null elements are counted in the length.
It has an alias cardinality().
Syntax
INT array_length(any_array)
Parameters
any_array
: the ARRAY value from which you want to retrieve the number of elements.
Return value
Returns an INT value.
Examples
mysql> select array_length([1,2,3]);
+-----------------------+
| array_length([1,2,3]) |
+-----------------------+
| 3 |
+-----------------------+
1 row in set (0.00 sec)
mysql> select array_length([1,2,3,null]);
+-------------------------------+
| array_length([1, 2, 3, NULL]) |
+-------------------------------+
| 4 |
+-------------------------------+
mysql> select array_length([[1,2], [3,4]]);
+-----------------------------+
| array_length([[1,2],[3,4]]) |
+-----------------------------+
| 2 |
+-----------------------------+
1 row in set (0.01 sec)
keywords
ARRAY_LENGTH, ARRAY, CARDINALITY