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NAME="CATALOG-PG-EXTENSION"
>48.22. <TT
CLASS="STRUCTNAME"
>pg_extension</TT
></A
></H1
><P
>   The catalog <TT
CLASS="STRUCTNAME"
>pg_extension</TT
> stores information
   about the installed extensions.  See <A
HREF="extend-extensions.html"
>Section 35.15</A
>
   for details about extensions.
  </P
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><P
><B
>Table 48-22. <TT
CLASS="STRUCTNAME"
>pg_extension</TT
> Columns</B
></P
><TABLE
BORDER="1"
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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"
>oid</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
>&nbsp;</TD
><TD
>Row identifier (hidden attribute; must be explicitly selected)</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>extname</TT
></TD
><TD
><TT
CLASS="TYPE"
>name</TT
></TD
><TD
>&nbsp;</TD
><TD
>Name of the extension</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>extowner</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-authid.html"
><TT
CLASS="STRUCTNAME"
>pg_authid</TT
></A
>.oid</TT
></TD
><TD
>Owner of the extension</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>extnamespace</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-namespace.html"
><TT
CLASS="STRUCTNAME"
>pg_namespace</TT
></A
>.oid</TT
></TD
><TD
>Schema containing the extension's exported objects</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>extrelocatable</TT
></TD
><TD
><TT
CLASS="TYPE"
>bool</TT
></TD
><TD
>&nbsp;</TD
><TD
>True if extension can be relocated to another schema</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>extversion</TT
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
>&nbsp;</TD
><TD
>Version name for the extension</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>extconfig</TT
></TD
><TD
><TT
CLASS="TYPE"
>oid[]</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-class.html"
><TT
CLASS="STRUCTNAME"
>pg_class</TT
></A
>.oid</TT
></TD
><TD
>Array of <TT
CLASS="TYPE"
>regclass</TT
> OIDs for the extension's configuration
       table(s), or <TT
CLASS="LITERAL"
>NULL</TT
> if none</TD
></TR
><TR
><TD
><TT
CLASS="STRUCTFIELD"
>extcondition</TT
></TD
><TD
><TT
CLASS="TYPE"
>text[]</TT
></TD
><TD
>&nbsp;</TD
><TD
>Array of <TT
CLASS="LITERAL"
>WHERE</TT
>-clause filter conditions for the
       extension's configuration table(s), or <TT
CLASS="LITERAL"
>NULL</TT
> if none</TD
></TR
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></DIV
><P
>   Note that unlike most catalogs with a <SPAN
CLASS="QUOTE"
>"namespace"</SPAN
> column,
   <TT
CLASS="STRUCTFIELD"
>extnamespace</TT
> is not meant to imply
   that the extension belongs to that schema.  Extension names are never
   schema-qualified.  Rather, <TT
CLASS="STRUCTFIELD"
>extnamespace</TT
>
   indicates the schema that contains most or all of the extension's
   objects.  If <TT
CLASS="STRUCTFIELD"
>extrelocatable</TT
> is true, then
   this schema must in fact contain all schema-qualifiable objects
   belonging to the extension.
  </P
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