PL/SQL block error - Mailing list pgsql-sql

Hello,<br /> I am very new to the postgres sql, i am trying to execute below pl/sql block in postgres but i am getting
error<b>'ERROR:  syntax error at or near "integer" '</b>, Could some one help me in this regard<br /><br /> declare<br
/>v_count integer;<br /> begin<br /> select  count(1) into v_count  from  pg_index inx where  inx.indexrelid in<br />
 (selectoid from pg_class where relname='action_pk' and relowner in <br />  (select oid from pg_authid where
rolname='postgres_ref'))<br />  and inx.indrelid in <br />  (select oid from pg_class where relname='action' and
relownerin <br />  (select oid from pg_authid where rolname='postgres_ref')); <br /><br /> if v_count = 0 then  <br />
executeimmediate 'create unique index action_pk    <br /> on action(acn_id)';  <br /> end if; <br /> end<br /><br /><br
/><br/><div class="moz-signature"></div><p style="margin-bottom: 0in;"><strong><font color="#939598"><font
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