Maps & structs Scalar

map_keys()

Returns the keys of a map as a list

Arguments & returns

Scalar

Overload link	… Varargs	Returns
#01	`ANY`	`LIST`

… accepts a variable number of arguments of the type shown.

SELECT map_keys(map(['key'], ['val']));

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Engine example · Run to view results.

Used in larger rewrites 1

These examples use map_keys as one part of a larger SQL translation.

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

In DuckDB

ARRAY_CONTAINS(MAP_KEYS(CAST({'k1': 'v1', 'k2': 'v2', 'k3': 'v3'} AS MAP(TEXT, TEXT))), 'k1')