MAP_CONTAINS_KEY¶

Syntax¶

MAP_CONTAINS_KEY( <key> , <map> )

Arguments¶

key

The key to find.

map

The map to be searched.

Returns¶

• Returns TRUE if the specified map contains the specified key.

• Returns FALSE if the specified map does not contain the specified key.

Usage Notes¶

• The type of the key expression must match the type of the map’s key. If the type is VARCHAR, the types can be different lengths.

• For NULL input, the output is NULL.

Examples¶

The function searches for the k1 key and finds it in the map:

SELECT MAP_CONTAINS_KEY(
  'k1',{'k1':'v1','k2':'v2','k3':'v3'}::MAP(VARCHAR,VARCHAR))
  AS contains_key;

+--------------+
| CONTAINS_KEY |
|--------------|
| True         |
+--------------+

The function searches for the k1 key and doesn’t find it in the map:

SELECT MAP_CONTAINS_KEY(
  'k1',{'ka':'va','kb':'vb','kc':'vc'}::MAP(VARCHAR,VARCHAR))
  AS contains_key;

+--------------+
| CONTAINS_KEY |
|--------------|
| False        |
+--------------+

A SELECT statement passes in a key that uses a different type than the key in the map:

SELECT MAP_CONTAINS_KEY(
  'k1',{'1':'va','2':'vb','3':'vc'}::MAP(NUMBER,VARCHAR))
  AS contains_key;

001065 (22023): SQL compilation error:
Function MAP_CONTAINS_KEY cannot be used with arguments of types VARCHAR(2) and map(NUMBER
(38,0), VARCHAR(16777216))