STRUCTFIELD"
>indkey</TT
></TD
><TD
><TT
CLASS="TYPE"
>int2vector</TT
></TD
><TD
><TT
CLASS="LITERAL"
><A
HREF="catalog-pg-attribute.html"
><TT
CLASS="STRUCTNAME"
>pg_attribute</TT
></A
>.attnum</TT
></TD
><TD
>       This is an array of <TT
CLASS="STRUCTFIELD"
>indnatts</TT
> values that
       indicate which table columns this index indexes.  For example a value
       of <TT
CLASS="LITERAL"
>1 3</TT
> would mean that the first and the third table
       columns make up the index key.  A zero in this arra