Select ranges from tables of ranges - sql

Question

I have 2 range tables ReceivedRanges and DispatchedRanges.
ReceivedRanges
From - To
1 - 100000
200000 - 300000
350000 - 400000
DispatchedRanges
From - To
10000 - 50000
250000 - 275000
350000 - 400000
I want to select new ranges from above 2 tables. output ranges will be:
InventoryRanges
From - To
1 - 9999
50001 - 100000
200000 - 249999
275001 - 300000
how to select these ranges from tables of ranges.
What I have Tried:
Alternately I have tried with generating all individual received sequence numbers as sequence table and marked dispatched numbers as is dispatched true.
based on this table i am grouping and able to retrieve InventoryRanges. But for these I need to store all the sequence number and update huge ranges during dispatch which will slowdown the dispatch process.

Answer 1

I think this will cover all your cases of finding differences between ranges in SQL. Hope this helps you out:
create table received_ranges(item_id int, [from] int, [to] int);
create table dispatched_ranges(item_id int, [from] int, [to] int);
insert into received_ranges (item_id,[from],[to]) values
(1, 1,5000),
(1, 7000,8000),
(2, 6000,9000),
(3, 10000,15000),
(4, 20000,25000);
insert into dispatched_ranges (item_id,[from],[to]) values
(1, 1,250),
(2, 6000,7250),
(2, 7500,8000),
(2, 8200, 9000),
(3, 12000,14000),
(4, 20000,25000);
with dispatched_batch(dispatched_batch_num, received_item, received_from, received_to, dispatched_item, dispatched_from, dispatched_to) as
(select row_number() over (partition by rr.item_id, rr.[from] order by rr.[from]) dispatched_batch_num,
rr.item_id as received_item,
rr.[from] as received_from,
rr.[to] as received_to,
dr.item_id as dispatched_item,
dr.[from] as dispatched_from,
dr.[to] as dispatched_to
from received_ranges rr
left join
dispatched_ranges dr
ON
rr.item_id = dr.item_id
AND
dr.[from] >= rr.[from]
AND
dr.[to] <= rr.[to])
select * from
(select
[current].[received_item],
case when [next].dispatched_batch_num is null then
case when [current].[received_to] <> [current].[dispatched_to] then
[current].dispatched_to + 1
else
0
end
else
case when [next].[dispatched_from] <> [current].[dispatched_to]+1 then
[current].[dispatched_to] + 1
else
0
end
end
as 'inventory from',
case when [next].dispatched_batch_num is null then
case when [current].[received_to] <> [current].[dispatched_to] then
[current].received_to
else
0
end
else
case when [next].[dispatched_from] <> [current].[dispatched_to]+1 then
[next].[dispatched_from] - 1
else
0
end
end
as 'inventory to'
from dispatched_batch [current]
left join
dispatched_batch [next]
on
[current].received_item = [next].received_item
and
[current].dispatched_batch_num + 1 = [next].dispatched_batch_num
UNION
select
[current].received_item,
case when [current].[dispatched_from] is null then
[current].[received_from]
else
case when [previous].dispatched_batch_num is null then
case when [current].[received_from] <> [current].[dispatched_from] then
[current].received_from
else
0
end
else
case when [previous].[dispatched_to] <> [current].[dispatched_from]+1 then
[previous].[dispatched_to] + 1
else
0
end
end
end
as 'inventory from',
case when [current].[dispatched_to] is null then
[current].[received_to]
else
case when [previous].dispatched_batch_num is null then
case when [current].[received_from] <> [current].[dispatched_from] then
[current].dispatched_from -1
else
0
end
else
case when [previous].[dispatched_to] <> [current].[dispatched_from]+1 then
[current].[dispatched_from] - 1
else
0
end
end
end
as 'inventory to'
from dispatched_batch [current]
left join
dispatched_batch previous
on
[current].received_item = previous.received_item
and
[current].dispatched_batch_num = previous.dispatched_batch_num + 1) result
where [inventory from] <> 0;

Answer 2

Assuming your table structure to be something like this:
create table received_ranges(received_date date, [from] int, [to] int);
create table dispatched_ranges(dispatched_date date, [from] int, [to] int);
and also assuming that there wont be multiple entries for each date in received_ranges or dispatched_ranges table (assumption made from the data provided) this query should work for you:
select date, inventory_from, inventory_to from
(select
rr.received_date as 'date',
case when rr.[from] = dr.[from] then
0
else
rr.[from]
end AS 'inventory_from',
case when rr.[from] = dr.[from] then
0
else
dr.[from] - 1
end AS 'inventory_to'
from
received_ranges rr left join
dispatched_ranges dr
on
rr.received_date = dr.dispatched_date
UNION
Select
rr.received_date as 'date',
case when rr.[to] = dr.[to] then
0
else
dr.[to]+1
end AS 'inventory_from',
case when rr.[to] = dr.[to] then
0
else
rr.[to]
end AS 'inventory_to'
from
received_ranges rr left join
dispatched_ranges dr
on
rr.received_date = dr.dispatched_date) result
where (inventory_from == 0 and inventory_to == 0) <> TRUE
order by inventory_from;