Postgresql, copy public schema to staging schema

copyPublicSchema.sql

DO $$
DECLARE
  table_rec record;
BEGIN
  FOR table_rec IN SELECT table_name
    FROM information_schema.tables
    WHERE table_schema = 'public'
    LOOP
      IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema = 'staging' AND table_name = table_rec.table_name) THEN
        EXECUTE 'TRUNCATE TABLE staging.' || table_rec.table_name || ';';
      ELSE
        EXECUTE 'CREATE TABLE staging.' || table_rec.table_name || ' AS TABLE public.' || table_rec.table_name || ' WITH NO DATA;';
      END IF;
        EXECUTE 'INSERT INTO staging.' || table_rec.table_name || ' SELECT * FROM public.' || table_rec.table_name || ';';
    END LOOP;
  END $$;