I know in Spain there is Real Madrid Castilla (the second team or team B of Real Madrid). In what other Country is it possible to find similar situation for football?

Tonight, too many goals were scored. In four games six or more goals were scored. 21 goals had been scored only in the first half of just 8 games. And there are another 8 games tomorrow. In every Champions League fixture the games are always played in two days. I am wondering if there is a fixt...