Recursive Query and INNER JOIN - sql

Question

I am stuck with a query that is using recursive and wondering if you guys can help me out.
I have this query below and it is based on the ShipQuantity, then it lists the number of records. For example, mfgPN "ABC123" has a ShipQuantity of 4, it will list 4 records with a number 1,2,3, 4.
WITH feedInfo
AS (
SELECT df1.RecID, MfgPN, LinkID, ShipQuantity, 1 AS Number
FROM EXT_DistributorFeed df1
WHERE 1 = 1
AND df1.mfgPN IN ('ABC1', 'ABC2')
UNION ALL
SELECT df2.RecID, df2.MfgPN, df2.LinkID, df2.ShipQuantity, feedInfo.number + 1 AS Number
FROM EXT_DistributorFeed df2
INNER JOIN feedInfo ON df2.RecID = feedInfo.RecID
WHERE 1 = 1
AND number < feedInfo.ShipQuantity
AND df2.mfgPN IN ('ABC1', 'ABC2')
)
Select feedInfo.*
From feedInfo
OPTION (maxrecursion 20000);
Let's say the result is
RecID MfgPN LinkID ShipQuantity Number
101 ABC1 L11111 4 1
102 ABC1 L11111 4 2
103 ABC1 L11111 4 3
104 ABC1 L11111 4 4
105 ABC2 L22222 2 1
106 ABC2 L22222 2 2
Now, I have another table "EXT_DistributorFeedDetail" where it may contain serial# (some part# have serial# and some part# don't have). This table has only two columns: (1) LinkID and (2)SerialNo. Like this:
EXT_DistributorFeedDetail
LinkID SerialNo
L22222 S999999
L22222 S888888
I would like to join the feedInfo with EXT_DistributorFeedDetail table to get the result like this:
RecID MfgPN LinkID ShipQuantity Number Serial
101 ABC1 L11111 4 1 NULL
102 ABC1 L11111 4 2 NULL
103 ABC1 L11111 4 3 NULL
104 ABC1 L11111 4 4 NULL
105 ABC2 L22222 2 1 S99999
106 ABC2 L22222 2 2 S88888
Any expert out there can help would be greatly appreciated.
Thank you,

Answer 1

Looks like you're trying to match up the LinkID and Number from the recursive query to the LinkID and a Row Number in the EXT_DistributorFeedDetail table
WITH feedInfo
AS (
SELECT df1.RecID, MfgPN, LinkID, ShipQuantity, 1 AS Number
FROM EXT_DistributorFeed df1
WHERE 1 = 1
AND df1.mfgPN IN ('ABC1', 'ABC2')
UNION ALL
SELECT df2.RecID, df2.MfgPN, df2.LinkID, df2.ShipQuantity, feedInfo.number + 1 AS Number
FROM EXT_DistributorFeed df2
INNER JOIN feedInfo ON df2.RecID = feedInfo.RecID
WHERE 1 = 1
AND number < feedInfo.ShipQuantity
AND df2.mfgPN IN ('ABC1', 'ABC2')
)
Select fi.*,
dfd.SerialNo [Serial]
From feedInfo fi
LEFT JOIN (SELECT *, ROW_NUMBER() OVER (PARTITION BY LinkID ORDER BY SerialNo) rn,
FROM EXT_DistributorFeedDetail) dfd
ON dfd.LinkID = fi.LinkID AND dfd.rn = fi.Number
OPTION (maxrecursion 20000);
Depending on what order you want the serial numbers in the EXT_DistributorFeedDetail table to be you would need to change the order by in the Window function ROW_NUMBER() OVER (PARTITION BY LinkID ORDER BY SerialNo) if you take out the Order by the it would be random and could change.

Answer 2

It looks like you want to join the SerialNo in descending order for the number. You can do this by changing the last part of the query to this:
with feedinfo as (
....
)
select f.*, e.*
from feedinfo f
left join (
select *, rn = row_number() over (partition by linkid order by serialno desc)
from ext_distributorfeeddetail
) e on f.linkid = e.linkid and f.number = e.rn
option (maxrecursion 20000);

Answer 3

You have to left join on the EXT_DistributorFeedDetail table to extract serial column. Note that for each recid in the output the serial column will be repeated as many times as the number of entries per linkid in the EXT_DistributorFeedDetail table.
WITH feedInfo AS
(
SELECT df1.RecID, MfgPN, LinkID, ShipQuantity, 1 AS Number
FROM EXT_DistributorFeed df1
WHERE df1.mfgPN IN ('ABC1', 'ABC2')
UNION ALL
SELECT df2.RecID, df2.MfgPN, df2.LinkID, df2.ShipQuantity,
feedInfo.number + 1 AS Number
FROM EXT_DistributorFeed df2
INNER JOIN feedInfo ON df2.RecID = feedInfo.RecID
WHERE number < feedInfo.ShipQuantity
AND df2.mfgPN IN ('ABC1', 'ABC2')
)
Select feedInfo.*, e.serial
From feedInfo
left join EXT_DistributorFeedDetail e
on e.linkid = feedinfo.linkid