Interface Function

All Superinterfaces:
Expression, Projection, Sql
All Known Subinterfaces:
AggregateFunction, ColumnFunction, SingleRowFunction, SystemFunction
All Known Implementing Classes:
Abs, Avg, Ceil, Concat, Count, CountAll, CurrentDate, CurrentTime, CurrentTimestamp, Floor, Length, Lower, Max, Min, Round, Substring, Sum, ToChar, ToNumber, Upper

public interface Function extends Expression
Defines a construct that evaluates to a single value, based upon zero, one or multiple rows.