unable to call a function

i've write this function that search if inside a specified table there's a
specified value:

CREATE FUNCTION check_if_if_exist(id INTEGER, table_name character(50),
table_column character(20) ) RETURNS BOOLEAN AS $$

BEGIN
RETURN EXECUTE 'SELECT EXISTS(SELECT * FROM table_name WHERE table_column =
id)';
END;

$$ LANGUAGE plpgsql

but when i try to call it i always receive an error and the function will
not call. where is the problem?

--
View this message in context: http://postgresql.1045698.n5.nabble.com/unable-to-call-a-function-tp5762590.html
Sent from the PostgreSQL - general mailing list archive at Nabble.com.