原标题：SQL 窗口函数到底是什么？
"Brazil and China have broad prospects for cooperation, and I regard my Chinese friends as brothers and sisters." Adair Caneiro, Chairman of Federation Chambers of Foreign Trade (FCCE) of Brazil, told China News Network. He said that China is Brazil's largest trading partner, and the friendship between the two countries is continuously deepening. The Brazilian people have a great affection for the Chinese people, and the business takes place in China is worth learning from.