CREATE FUNCTION pg_get_serial_sequence(name, name, name) RETURNS text
    AS '
	SELECT 
		pg_catalog.quote_ident(pn_seq.nspname) || ''.'' || pg_catalog.quote_ident(seq.relname)
	FROM
		pg_catalog.pg_namespace pn,
		pg_catalog.pg_class pc, 
		pg_catalog.pg_attribute pa, 
		pg_catalog.pg_depend pd, 
		pg_catalog.pg_class seq,
		pg_catalog.pg_namespace pn_seq
	WHERE 
		pn.nspname=$1
		AND pc.relname=$2
		AND pa.attname=$3
		AND pn.oid=pc.relnamespace
		AND pc.oid=pa.attrelid
		AND pd.objid=seq.oid
		AND pd.classid=seq.tableoid
		AND pd.refclassid=seq.tableoid
		AND pd.refobjid=pc.oid
		AND pd.refobjsubid=pa.attnum
		AND pd.deptype=''i''
		AND seq.relkind=''S''
		AND seq.relnamespace=pn_seq.oid
'
    LANGUAGE sql;