Return table in function postgres

Question

When trying to return table in postgres, this my query:

CREATE OR REPLACE FUNCTION list_log_approval(IN p_create_code INTEGER,IN p_update_code INTEGER) RETURNS
TABLE(processcode integer, processname VARCHAR,id BIGINT, pleader CHARACTER VARYING,activity VARCHAR,date_plead timestamp)
LANGUAGE plpgsql AS $$ 
BEGIN
 IF NOT EXISTS( SELECT * FROM log_approval WHERE processcode = 1ドル and status = 'A' or status = 'D')AND NOT EXISTS(SELECT * FROM log_approval WHERE processcode = 2ドル and status = 'A' or status = 'D') THEN
 RETURN QUERY SELECT * from vw_list_appv;
 END IF;
 RETURN;
END $$;

-- i call like this

select * from list_log_approval(1070,1072)

I get the following error:

[Err] ERROR: column reference "processcode" is ambiguous
LINE 3: processcode**

why is it ambiguous?

Answer 1

processcode is used both as function parameter and as table column.

The best thing is to use function parameters with a different name, like p_processcode.

But you can also disambiguate by qualifying the name: log_approval.processcode for the column and list_log_approval.processcode for the function parameter.