<prompt> Tengeneza hoja ili kupata wateja wote ambao wamefanya ununuzi zaidi ya 50Jedwali lililopewa: mteja na uuzaji.  <response>: CHAGUA jina_la_mteja KUTOKA KWA mteja c JIUNGE na mauzo KWENYE c.customer_id s.customer_id GROUP BY s.customer_id HAVING COUNTs.customer_id 50; 