Вручную написанная функция не работает

CREATE OR REPLACE FUNCTION insertCity(cityname text, regionname text, location POINT)
    RETURNS VARCHAR AS $$
BEGIN
    IF (Within(location, region.geo)) THEN 
      INSERT INTO cities VALUES (cityname, regionname, location);
      RETURN 'The city ' || cityname || ' is put in';
    ELSE
      RETURN 'The city ' || cityname || ' is not put in';
    END IF;
END;
$$ LANGUAGE plpgsql;

SELECT insertCity('Colomna', 'Moscow', PointFromText('POINT(12 9)', -1));

CREATE OR REPLACE FUNCTION fuegeInGemeindeEin
      (pGkz INTEGER, pName VARCHAR) RETURNS VOID AS $$
    DECLARE
      minEinw INTEGER;
    BEGIN
      SELECT Min(einw) INTO minEinw FROM Gemeinden;
      INSERT INTO Gemeinden (gkz,name,einw)
                  VALUES (pGkz,pName,minEinw);
    END;
    $$ LANGUAGE plpgsql;
 
    SELECT fuegeInGemeindeEin (3361009,'Oyten');

CREATE OR REPLACE FUNCTION fuelleLogHS()
   RETURNS NUMERIC AS $$
DECLARE
  ds  RECORD;       -- aktuelle Antwort
  n   NUMERIC;      -- Zahl der Antworten
BEGIN
  n := 0;
  -- alle Antworten durchlaufen
  FOR ds IN SELECT * FROM Hochschulen LOOP
    INSERT INTO LogHochschulen
      VALUES (ds.num,ds.stud,current_timestamp);
    n := n+1;
  END LOOP;
  RETURN n;
END;
$$ LANGUAGE plpgsql;