On 06/19/2018 01:14 PM, Hellmuth Vargas wrote:
Hi
with partial sum:
with recursive pizza (name, step, ingredient, quantity, unit, rel_qty,
path, weight)
as (
select
name, step, ingredient, quantity, unit
, quantity::numeric(10,2)
, step::text
, case when unit = 'g' then quantity::numeric(10,2) else
null end
from recipe
where name = 'pizza'
union all
select
recipe.name <http://recipe.name>, recipe.step, recipe.ingredient,
recipe.quantity, recipe.unit
, (pizza.rel_qty * recipe.quantity)::numeric(10,2)
, pizza.path || '.' || recipe.step
, case when recipe.unit = 'g' then (pizza.rel_qty *
recipe.quantity)::numeric(10,2) else null end
from pizza
join recipe on (recipe.name <http://recipe.name> =
pizza.ingredient)
)
select path, ingredient, quantity, rel_qty, unit, weight,*sum(weight)
over(partition by split_part(path,'.',1)) as parcial_weight*,
*sum(weight) over() as total_weight*
from pizza
order by path;
path | ingredient | quantity | rel_qty | unit | weight |
parcial_weight | total_weight
-------+--------------+----------+---------+-------+--------+----------------+--------------
1 | tomato sauce | 1.00 | 1.00 | pcs | |
113.00 | 313.00
1.1 | tomato | 100.00 | 100.00 | g | 100.00 |
113.00 | 313.00
1.2 | basil | 10.00 | 10.00 | g | 10.00 | 113.00
| 313.00
1.3 | salt | 3.00 | 3.00 | g | 3.00 | 113.00
| 313.00
2 | pizza bottom | 1.00 | 1.00 | pcs | |
200.00 | 313.00
2.2 | dough | 1.00 | 1.00 | pcs | | 200.00
| 313.00
2.2.1 | flour | 150.00 | 150.00 | g | 150.00 | 200.00
| 313.00
2.2.2 | water | 50.00 | 50.00 | g | 50.00 | 200.00
| 313.00
2.2.3 | salt | 1.00 | 1.00 | pinch | | 200.00
| 313.00
(9 rows)
This is gorgeous but I suspect any level greater than 10 wide will
present sorting problems, no? Maybe a fixed two-digit, zero filled
number per level? Pushing the problem off by an order of magnitude :)
An exercise left to the OP perhaps.
