Robert Haas wrote:
The advantage of specifying a + and a - in the type interface is that
the unit definition can then be specified as part of the type
declaration itself.  So you can do:

CREATE TYPE ts_sec AS RANGE OVER timestamp (UNIT = '1s');
CREATE TYPE ts_min AS RANGE OVER timestamp (UNIT = '1m');
The problem with mixing units with ranges is that units are properties of some underlying datatype but not all types on which ranges can be defined.

regards,
Yeb Havinga


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