Postando a Resposta do desafio ;)
SELECT c.nome, sum(ip.precounitario )
FROM clientes c
JOIN pedidos p on c.id = p.idcliente
JOIN itenspedidos ip on p.id = ip.idpedidos
GROUP BY c.nome
ORDER BY sum(ip.precounitario ) desc;
Postando a Resposta do desafio ;)
SELECT c.nome, sum(ip.precounitario )
FROM clientes c
JOIN pedidos p on c.id = p.idcliente
JOIN itenspedidos ip on p.id = ip.idpedidos
GROUP BY c.nome
ORDER BY sum(ip.precounitario ) desc;