How to join tables, concatenate some data - sql

Question

I have two tables:
1. indexes and quantity of indexes
2. indexes and quantity of indexes with specified boxcodes. Boxcode is a number of box, which box contains indexes.
1. input table 1
item_id quantity
1 10
2 15
3 5
1 5
1 5
2 5
3 5
sum:
1 - 20
2 - 20
3 - 10
2. input table 2
item_id quantity boxcode
1 3 abc
2 2 abc
1 8 def
3 10 ghi
1 9 ghi
2 9 def
2 8 ghi !!!!!!!
1 item_id once on 1 boxcode
I want to get result:
3. result
item_id quantity boxcodes
1 10 abc/3, def/7
2 15 abc/2, def/9, ghi/4
3 5 ghi/5
1 5 def/1, ghi/4
1 5 ghi/5
2 5 ghi/4 !!!!!!!!
3 5 ghi/5
Records from table 1 must be in the same order.
I have no idea how it can be done.
Any suggestion?
CREATE TABLE #input1
(
rownum int,
item_id int,
quantity int
)
CREATE TABLE #input2
(
item_id int,
quantity int,
boxcode varchar(10)
)
INSERT INTO #input1 VALUES (1,1,10)
INSERT INTO #input1 VALUES (2,2,15)
INSERT INTO #input1 VALUES (3,3,5)
INSERT INTO #input1 VALUES (4,1,5)
INSERT INTO #input1 VALUES (5,1,5)
INSERT INTO #input1 VALUES (6,2,5)
INSERT INTO #input1 VALUES (7,3,5)
INSERT INTO #input2 VALUES (1,3, 'abc')
INSERT INTO #input2 VALUES (2,2, 'abc')
INSERT INTO #input2 VALUES (1,8, 'def')
INSERT INTO #input2 VALUES (3,10, 'ghi')
INSERT INTO #input2 VALUES (1,9, 'ghi')
INSERT INTO #input2 VALUES (2,9, 'def')
INSERT INTO #input2 VALUES (2,8, 'ghi')
select * from #input1
select * from #input2
drop table #input1
drop table #input2
result
Thanks,

Answer 1

Weird, but it works:
;WITH rec1 AS (
SELECT rownum,
item_id,
1 as q,
1 as [Level],
quantity
from #input1
UNION ALL
SELECT r.rownum,
r.item_id,
1,
[Level] + 1,
i.quantity
FROM rec1 r
INNER JOIN #input1 i
ON r.rownum = i.rownum AND r.item_id = i.item_id
WHERE [Level] < i.quantity
), rec2 AS (
SELECT boxcode,
item_id,
1 as q,
1 as [Level],
quantity
from #input2
UNION ALL
SELECT r.boxcode,
r.item_id,
1,
[Level] + 1,
i.quantity
FROM rec2 r
INNER JOIN #input2 i
ON r.boxcode = i.boxcode AND r.item_id = i.item_id
WHERE [Level] < i.quantity
), cte1 AS (
SELECT *,
ROW_NUMBER() OVER (PARTITION BY item_id ORDER BY item_id, rownum) as rn
FROM rec1
), cte2 AS (
SELECT *,
ROW_NUMBER() OVER (PARTITION BY item_id ORDER BY item_id, boxcode) as rn
FROM rec2
), final AS (
SELECT c1.rownum,
c1.item_id,
c1.quantity,
c2.boxcode+'/'+CAST(SUM(c2.q) as nvarchar(10)) as boxcodes
FROM cte1 c1
INNER JOIN cte2 c2
ON c1.item_id = c2.item_id and c1.rn = c2.rn
GROUP BY c1.rownum, c1.item_id, c1.quantity, c2.boxcode
)
SELECT DISTINCT
f.rownum,
f.item_id,
f.quantity,
STUFF((
SELECT ', '+f1.boxcodes
FROM final f1
WHERE f1.rownum = f.rownum
AND f1.item_id = f.item_id
AND f1.quantity = f.quantity
FOR XML PATH('')
),1,2,'') boxcodes
FROM final f
Output for dataset you have provided:
rownum item_id quantity boxcodes
1 1 10 abc/3, def/7
2 2 15 abc/2, def/9, ghi/4
3 3 5 ghi/5
4 1 5 def/1, ghi/4
5 1 5 ghi/5
6 2 5 ghi/4
7 3 5 ghi/5
The main idea is to spread quantity in both tables for a small parts 1. Than add row number, then join and get result.

Answer 2

A solution (but it's totally based on gofr1's answer, to be honest !), to simplify a bit, would be to create a Numbers table, with as many numbers as you want.
CREATE TABLE Numbers(Number INT PRIMARY KEY);
INSERT Numbers
SELECT TOP 1000 ROW_NUMBER() OVER (ORDER BY name)
FROM sys.all_columns;
That would just avoid the 2 recursive CTEs.
You could then use the same logic as gofr1 :
with rec1 AS (
SELECT
ROW_NUMBER() OVER (PARTITION BY item_id ORDER BY item_id, rownum) as rn,
rownum,
item_id,
case when quantity = 0 then 0 else 1 end as q,
quantity
from #input1
join Numbers n on n.Number <= quantity
)
, rec2 AS (
SELECT
ROW_NUMBER() OVER (PARTITION BY item_id ORDER BY item_id, boxcode) as rn,
boxcode,
item_id,
case when quantity = 0 then 0 else 1 end as q,
quantity
from #input2
join Numbers n on n.Number <= quantity
),
final AS (
SELECT c1.rownum,
c1.item_id,
c1.quantity,
c2.boxcode+'/'+CAST(SUM(c2.q) as nvarchar(10)) as boxcodes
FROM rec1 c1
INNER JOIN rec2 c2
ON c1.item_id = c2.item_id and c1.rn = c2.rn
GROUP BY c1.rownum, c1.item_id, c1.quantity, c2.boxcode
),
stuffed as (
SELECT
distinct rownum,
f.item_id,
f.quantity,
STUFF((
SELECT ', '+f1.boxcodes
FROM final f1
WHERE f1.rownum = f.rownum
AND f1.item_id = f.item_id
AND f1.quantity = f.quantity
FOR XML PATH('')
),1,2,'') boxcodes
FROM final f
group by item_id, quantity, boxcodes, rownum)
select *
from stuffed
order by rownum