Presto SQL - 用0填充范围内的缺失值

Question

Here is the initial table:

id range val
1  -4.   2
1  -2.   1
1. 1.    1
1  3.    2
1  4.    1
2. -1.   1
2. 0.    1
2. 1.    1

Updated Table:

id range val
1  -4.   2
1. -3.   0
1  -2.   1
1. -1.   0
1. 0.    0
1. 1.    1
1. 2.    0
1  3.    2
1  4.    1
2. -1.   1
2. 0.    1
2. 1.    1
2. 2.    0
2  3.    0
2  4.    0

Desired Logic:

• Each id will have some range.
• For each id , the lower end of the range will be different but the upper end will be the max max value in the entire table.
• For any missing values within that id's updated range, it will be imputed with 0

I am no SQL wiz so i'm a bit lost. Any help would be much appreciated. Let me know if anything is confusing about the logic.

Answer 1

If for each range value, you have at least one value, then I think you want:

select i.id, t.range, coalesce(t.value, 0) as value
from (select distinct id from t) i cross join
     (select distinct range from t where range > 0) r left join
     t
     on t.id = i.id and t.range = r.range
union all
select id, range, value
from t
where range <= 0;

How does this work? The first subquery generates all combinations of the ids and range values, where the range value is greater than 0. It does this using a Cartesian product of the distinct id and range values.

The LEFT JOIN then brings in the existing data. And the final subquery brings in the detritus -- the values less than 0.