Returns a subset of tuples from a specified set.
Subset(«Set», «Start»[, «Count»])
This function returns «Count» tuples from «Set» as a set, starting at position «Start». «Start» is zero-based: 0 corresponds to the first tuple in the set, 1 corresponds to the second, and so on. If «Count» is not specified, all tuples from «Start» to the end of the set are returned.
The following example returns the set {USA, Canada}
:
Subset({USA, Canada, France, Germany, Japan, England, Peru}, 0, 2)