      performed within a transaction block, but
      <TT
CLASS="COMMAND"
>DROP INDEX CONCURRENTLY</TT
> cannot.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>IF EXISTS</TT
></DT
><DD
><P
>      Do not throw an error if the index does not exist. A notice is issued
      in this case.
     </P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
></DT
><DD
><P
>      The name (optionally schema-qualified) of an index to remove.
     </P
></DD
><DT
><TT
CLASS="LITERAL"
>CASCADE</TT
></DT
><DD
><P
>      Automat