Range Types
range types can be used to identify certain types (range's subtype) range. For example: ranges of timestamp conference room may be used to represent a predetermined start and end times, corresponding to the type of tsrange, and the timestamp of the subtype tsrange. subtype must be able to be ordered in some way, so as to determine a value in the range is the range, or before or after.
range type is very effective, because it is only one value can be expressed in a series of values within a certain range, and the concept of overlapping ranges, the range type can be simple and clearly expressed. Using the range type of common scenarios such as: arrange time and date range on the agenda of the meeting.
The current range of types of built-in support
The current ADB PG 6.0 PG baseline code into engagement 9.4, so