1 배열에 번호 붙이기

--ver 9.4
--방법1
;with foo
as
(
	select 1 id, array['a','b','c'] val
	union all
	select 2 id, array['d','e','f'] val
)
select 
	a.id
,	a.val[b.seq] val
,	b.seq
from foo a
	cross join lateral generate_subscripts(val, 1) b(seq);

--방법2
;with foo
as
(
	select 1 id, array['a','b','c'] val
	union all
	select 2 id, array['d','e','f'] val
)
select
	a.id
,	b.val
,	b.seq
from foo a
	cross join lateral unnest(val) with ordinality b(val, seq);