insert into pyramiddata_2tiles (
pyrdata_id, img_id, level, tilex_a, tiley_a, x_a, y_a, x0_a, y0_a, w_a, h_a,
tilex_b, tiley_b, x_b, y_b, x0_b, y0_b, w_b, h_b, hash, tile_data
)
select a.pyrdata_id as pyrdata_id
	,a.img_id as img_id
	,a.level as level 
	,a.tilex as tilex_a
	,a.tiley as tiley_a
	,a.x as x_a
	,a.y as y_a
	,a.x0 as x0_a
	,a.y0 as y0_a
	,a.w as w_a
	,a.h as h_a
	,b.tilex as tilex_b
	,b.tiley as tilex_b
	,a.x as x_b
	,a.y as y_b
	,b.x0 as x0_b
	,b.y0 as y0_b
	,b.w as w_b
	,b.h as h_b
	,a.hash as hash
	,a.tile_data||b.tile_data as tile_data
from (
select *
from pyramiddata
where level >= 3
and level <= 6
--and img_id = 1
and tile_data is not null
) a
JOIN (
select *
from pyramiddata
where level >= 4
and level <= 7
--and img_id = 1
and tile_data is not null
) b
on a.img_id = b.img_id
and a.level + 1 = b.level
and a.tilex / 2 = b.tilex
and a.tiley / 2 = b.tiley