Categories:: Aggregate Functions (Counting Distinct Values) , Window Functions (Semi-structured Data Aggregation)

ARRAY_UNIQUE_AGG¶

Returns an ARRAY that contains all of the distinct values from the specified column.

See also:: Using Arrays to Compute Distinct Values for Hierarchical Aggregations

Syntax¶

ARRAY_UNIQUE_AGG( <column> )

Copy

Arguments¶

column: The column containing the values.

Returns¶

The function returns an ARRAY containing the distinct values in the specified column. The values in the ARRAY are in no particular order, and the order is not deterministic.

The function ignores NULL values in column. If column contains only NULL values or the table containing column is empty, the function returns an empty ARRAY.

Usage Notes¶

This function can be used as either of the following types of functions:
- aggregate function
- window function.
  
  When used as a window function, this does not support window frames.

This function does not support a structured type as an input argument.

Examples¶

Aggregation¶

See Using Arrays to Compute Distinct Values for Hierarchical Aggregations.