element_at

Description

Returns the value for the specified key from a key-value pair of a map. If any input parameter is NULL or if the key does not exist in the map, the result is NULL.

If you want to retrieve an element from an array, see element_at.

Syntax

element_at(any_map, any_key)

Parameters

  • any_map: a MAP expression from which to retrieve values.
  • any_key: a key in the map.

Return value

If any_key exists in any_map, the value corresponding to the key will be returned. Otherwise, NULL is returned.

Examples

mysql> select element_at(map{1:3,2:4},1);
+-------------------------+
| element_at({1:3,2:4},1) |
+-------------------------+
|                     3   |
+-------------------------+

mysql> select element_at(map{1:3,2:4},3);
+-------------------------+
| element_at({1:3,2:4},3) |
+-------------------------+
|                    NULL |
+-------------------------+

mysql> select element_at(map{'a':1,'b':2},'a');
+-----------------------+
| map{'a':1,'b':2}['a'] |
+-----------------------+
|                     1 |
+-----------------------+

keywords

ELEMENT_AT, MAP

In this article
Copyright © 2024 CelerData