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>47.37. <TT
CLASS="STRUCTNAME"
>pg_range</TT
></A
></H1
><P
>   The catalog <TT
CLASS="STRUCTNAME"
>pg_range</TT
> stores information about
   range types.  This is in addition to the types' entries in
   <A
HREF="catalog-pg-type.html"
><TT
CLASS="STRUCTNAME"
>pg_type</TT
></A
>.
  </P
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><B
>Table 47-37. <TT
CLASS="STRUCTNAME"
>pg_range</TT
> Columns</B
></P
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><COL><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Type</TH
><TH
>References</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>rngtypid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-type.html"
><TT
CLASS="STRUCTNAME"
>pg_type</TT
></A
>.oid</TT
></TD
><TD
>OID of the range type</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>rngsubtype</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-type.html"
><TT
CLASS="STRUCTNAME"
>pg_type</TT
></A
>.oid</TT
></TD
><TD
>OID of the element type (subtype) of this range type</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>rngcollation</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-collation.html"
><TT
CLASS="STRUCTNAME"
>pg_collation</TT
></A
>.oid</TT
></TD
><TD
>OID of the collation used for range comparisons, or 0 if none</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>rngsubopc</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-opclass.html"
><TT
CLASS="STRUCTNAME"
>pg_opclass</TT
></A
>.oid</TT
></TD
><TD
>OID of the subtype's operator class used for range comparisons</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>rngcanonical</TT
></TD
><TD
><TT
CLASS="TYPE"
>regproc</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-proc.html"
><TT
CLASS="STRUCTNAME"
>pg_proc</TT
></A
>.oid</TT
></TD
><TD
>OID of the function to convert a range value into canonical form,
      or 0 if none</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>rngsubdiff</TT
></TD
><TD
><TT
CLASS="TYPE"
>regproc</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
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><TT
CLASS="STRUCTNAME"
>pg_proc</TT
></A
>.oid</TT
></TD
><TD
>OID of the function to return the difference between two element
      values as <TT
CLASS="TYPE"
>double precision</TT
>, or 0 if none</TD
></TR
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><P
>   <TT
CLASS="STRUCTFIELD"
>rngsubopc</TT
> (plus <TT
CLASS="STRUCTFIELD"
>rngcollation</TT
>, if the
   element type is collatable) determines the sort ordering used by the range
   type.  <TT
CLASS="STRUCTFIELD"
>rngcanonical</TT
> is used when the element type is
   discrete.  <TT
CLASS="STRUCTFIELD"
>rngsubdiff</TT
> is optional but should be supplied to
   improve performance of GiST indexes on the range type.
  </P
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