Código SQL [-] SELECT C.IDCLIENTE,NOMBRE, DNI, COUNT(IDVENTA) AS NUMVENTAS FROM ( CLIENTE C INNER JOIN VENTA V ON C.IDCLIENTE=V.IDCLIENTE) GROUP BY NOMBRE,DNI,C.IDCLIENTE HAVING COUNT(IDVENTA)> 1 ORDER BY 4 DESC
SELECT C.IDCLIENTE,NOMBRE, DNI, COUNT(IDVENTA) AS NUMVENTAS FROM ( CLIENTE C INNER JOIN VENTA V ON C.IDCLIENTE=V.IDCLIENTE) GROUP BY NOMBRE,DNI,C.IDCLIENTE HAVING COUNT(IDVENTA)> 1 ORDER BY 4 DESC