My little attempt to create christmas tree:
WITH RECURSIVE tree(b, l, lv) AS
(
(
WITH RECURSIVE t(b, l) AS
(
select b/11.6, 0 AS l from (select generate_series(0,30)::float8
b union all select generate_series(30,0, -1)::float8 b) ziew
UNION ALL
select (b*1.06), l+1 FROM t WHERE l < 3
)
select b, l, 1 AS lv from t order by l asc
)
UNION ALL
select b*1.1, l+(lv*62) AS l , lv+1 FROM tree WHERE lv < 4
)
select array_to_string(array_agg(SUBSTRING(' ....,--++++****####',
LEAST(GREATEST(b::integer,1),20), 1)),'') from tree group by l order
by l asc;
hohoho :P
--
GJ