SQL Select to return one line multiple times based on a number within the dataset - sql

Question

So I've tried many other attempts at answers around this topic from here and so far everything has either outright failed or not given me the result I'm after:
I have a select statement to use for a report that brings through delivery information. The result set is from a main table that only has one line per delivery number (the delivery header record) and within the dataset there is also a field called palletspaces which we use to indicate (you guessed it) how many pallets are needed for the delivery
What I now need to do is the following:
find that palletspaces number
return the single delivery record the same number of times as that palletspaces number
include a new column in the results that counts up to that palletspaces number
so for instance, my SQL will return every record from the deliveries table and would look something like this
id traderid toaddressid county postcode palletspaces
D-124597 2101 2 READING RG6 1AZ 3
D-124600 20060 12 MAGOR, GWENT NP26 3DF 1
D-124601 20060 13 RUGBY CV23 8YH 2
So now, I'd need to see that palletspaces number, then return the particular line that many times and then also have a new column that counts these instances:
id traderid toaddressid county postcode palletspaces LineCount
D-124597 2101 2 READING RG6 1AZ 3 1
D-124597 2101 2 READING RG6 1AZ 3 2
D-124597 2101 2 READING RG6 1AZ 3 3
D-124600 20060 12 MAGOR, GWENT NP26 3DF 1 1
D-124601 20060 13 RUGBY CV23 8YH 2 1
D-124601 20060 13 RUGBY CV23 8YH 2 2
The other thing to mention is that naturally I'll have hundreds of different delivery records (all returned as one line each) and all will have differing palletspaces numbers. And of course stating the obvious I need the line to only replicate and count based on it's own palletspaces number
The SQL in use is as below
select
deliveries.id,
deliveries.traderid,
customers.name,
deliveries.toaddressid,
deliveries.eutransportid,
deliveries.street,
deliveries.city,
deliveries.county,
deliveries.postcode,
delivery_custom.palletspaces,
ectransport.ectranspdesc
from deliveries
INNER JOIN customers ON
deliveries.traderid = customers.id
INNER JOIN delivery_custom ON
deliveries.id = delivery_custom.id
INNER JOIN ectransport ON
deliveries.eutransportid = ectransport.ectranspcode

Answer 1

Try like this:
select deliveries.id,
deliveries.traderid,
customers.name,
deliveries.toaddressid,
deliveries.eutransportid,
deliveries.street,
deliveries.city,
deliveries.county,
deliveries.postcode,
delivery_custom.palletspaces,
ectransport.ectranspdesc
INTO #MyTemp
from deliveries
INNER JOIN customers ON
deliveries.traderid = customers.id
INNER JOIN delivery_custom ON
deliveries.id = delivery_custom.id
INNER JOIN ectransport ON
deliveries.eutransportid = ectransport.ectranspcode
;WITH CTE AS(
SELECT id,traderid,toaddressid,county,postcode,palletspaces,1 AS LineCount
FROM #MyTemp
UNION ALL
SELECT id,traderid,toaddressid,county,postcode,palletspaces,LineCount+1
FROM CTE
WHERE LineCount<palletspaces
)
SELECT *
FROM CTE
ORDER BY id, LineCount;
DROP TABLE #MyTemp
Hope this time you get it.

Answer 2

Using Recursive CTE, we can achieve this:
DECLARE #TAB TABLE ([D Number] VARCHAR(20) ,customer INT, postcode VARCHAR(20), palletspaces INT)
INSERT INTO #TAB VALUES('D-123456' ,19114, 'DA12 1TF' , 4)
INSERT INTO #TAB VALUES('D-111111' ,19114, 'DDDD 1TF' , 3)
;WITH CTE AS(
SELECT [D Number],customer,postcode,palletspaces,1 AS A
FROM #TAB
UNION ALL
SELECT [D Number],customer,postcode,palletspaces,A+1
FROM CTE
WHERE A<palletspaces
)
SELECT *
FROM CTE
ORDER BY [D Number], LineCount;
Output:
D Number customer postcode palletspaces LineCount
D-123456 19114 DA12 1TF 4 1
D-123456 19114 DA12 1TF 4 2
D-123456 19114 DA12 1TF 4 3
D-123456 19114 DA12 1TF 4 4