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You can use the information_schema.routines view to return information about SQL functions including their database, schema, name, type, return data type, parameter data types, and whether they are deterministic. Example The following code example lists all aggregate functions in the database and displays their name, parameters, and return data type, sorted by function name: 
SELECT
  routine_name || '(' || array_to_string(routine_parameters) || ') => ' || data_type
FROM
  information_schema.routines
WHERE
  routine_type = 'AGGREGATE FUNCTION'
ORDER BY routine_name
Example The following code example retrieves the names of all routines from the database that return a data type of GEOGRAPHY: 
SELECT
  routine_name
FROM
  information_schema.routines
WHERE
  data_type = 'geography'

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Columns in information_schema.routines

Each row in information_schema.routines contains the following information about the SQL function:
Column NameData TypeDescription
routine_catalogTEXTThe database containing the function.
routine_schemaTEXTThe schema containing the function.
routine_nameTEXTThe name of the function.
routine_typeTEXTThe type of the function, which can be either FUNCTION, AGGREGATE FUNCTION, WINDOW FUNCTION or TABLE FUNCTION.
data_typeTEXTThe return type name of the function. These type names are simplified, for example, returning ARRAY instead of ARRAY(INT). If the function accepts and returns data any type, its data_type is ANY.
is_deterministicTEXTA flag that indicates if the function is deterministic or not. A deterministic function returns the same output when called with the same inputs within the same query, even if it can produce a different output when called in a different query. An example of a deterministic function is CURRENT_TIMESTAMP. An example of a non-deterministic function is RANDOM.
routine_parametersARRAY(TEXT)An array of data types representing the function’s parameters.
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