src/pgperf/90/pg_stat_activity.sql

SELECT 0::int as sid,
       datid,
       datname,
       procpid,
       usesysid,
       usename,
       application_name,
       client_addr,
       client_port,
       backend_start,
       xact_start,
       query_start,
       waiting,
       current_query
  FROM pg_stat_activity;