PostgreSQL

51.42. `pg_range`
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51.42. `pg_range`

The catalog pg_range stores information about range types. This is in addition to the types' entries in pg_type.

Table 51.42. pg_range Columns

Name Type References Description

Name	Type	References	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

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. rngsubdiff is optional but should be supplied to improve performance of GiST indexes on the range type.

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PostgreSQL

51.42. pg_range

51.42. `pg_range`