PG_RANGE¶
PG_RANGE records information about range types.
This is in addition to the types' entries in PG_TYPE.
Name | Type | Reference | Description |
|---|---|---|---|
rngtypid | oid | PG_TYPE.oid | OID of the range type |
rngsubtype | oid | PG_TYPE.oid | OID of the element type (subtype) of this range type |
rngcollation | oid | PG_COLLATION.oid | OID of the collation used for range comparisons, or 0 if none |
rngsubopc | oid | PG_OPCLASS.oid | OID of the subtype's operator class used for range comparisons |
rngcanonical | regproc | PG_PROC.oid | OID of the function to convert a range value into canonical form, or 0 if none |
rngsubdiff | regproc | PG_PROC.oid | OID of the function to return the difference between two element values as double precision, or 0 if none |
rngsubopc (plus rngcollation, if the element type is collatable) determines the sort ordering used by the range type. rngcanonical is used when the element type is discrete.