UPDATE SBASLIK 
SET SATFISEKUNO = '2'
WHERE SATGENELTOP > 0 
  AND SATFISEKUNO IS NULL
  AND SATTARIHI >= DATEADD(-6 MONTH TO CURRENT_DATE)
  AND EXISTS (
      SELECT 1 
      FROM SBASLIK AS ALT
      WHERE ALT.SATFIRMAADI = SBASLIK.SATFIRMAADI
        AND ALT.SATTARIHI = SBASLIK.SATTARIHI
        AND ALT.SATGENELTOP > 0 
        AND ALT.SATFISEKUNO IS NULL
        AND ALT.SATFIRMAADI<>'PAREKENDE'
      GROUP BY ALT.SATFIRMAADI, ALT.SATTARIHI
      HAVING COUNT(*) > 5
  );