Fezi
asked on
MS SQL join complex subquery
I am trying to combine my query into a join to bring back some records.
Here is the first part of my query, this does exactly what I want and returns the latest record from this result set as each one is linked to the other as show below.
pkSDSID fkSDSID
50605 NULL
88377 50605
90602 88377
90616 90602
This query returns 90616 from the results.
DECLARE @LatestSDS INT
with tree as (
SELECT pkSDSID, fkSDSID
FROM tblSDS
WHERE pkSDSID = 50605
UNION ALL
SELECT t1.pkSDSID, t1.fkSDSID
FROM tblSDS t1
JOIN tree p ON p.pkSDSID = t1.fkSDSID
)
SELECT TOP 1 @LatestSDS = pkSDSID FROM tree ORDER BY pkSDSID DESC
SELECT @LatestSDS
This is fine if I have one record I want to find but what I'm now stuck on his how to do this for multiple records.
I was wondering if I could inner join this somehow using it as a sub query of my main query but I cant seem to find a way to get it to work.
What I would like is to use the pkSDSID like above which is 50605 but use a column of a table and get the LastestSDS for each record.
I hope this makes sense I'm not all that great with SQL and I just don't know where to go from here.
Is this possible?
I appreciate all help. Thank you.
Here is the first part of my query, this does exactly what I want and returns the latest record from this result set as each one is linked to the other as show below.
pkSDSID fkSDSID
50605 NULL
88377 50605
90602 88377
90616 90602
This query returns 90616 from the results.
DECLARE @LatestSDS INT
with tree as (
SELECT pkSDSID, fkSDSID
FROM tblSDS
WHERE pkSDSID = 50605
UNION ALL
SELECT t1.pkSDSID, t1.fkSDSID
FROM tblSDS t1
JOIN tree p ON p.pkSDSID = t1.fkSDSID
)
SELECT TOP 1 @LatestSDS = pkSDSID FROM tree ORDER BY pkSDSID DESC
SELECT @LatestSDS
This is fine if I have one record I want to find but what I'm now stuck on his how to do this for multiple records.
I was wondering if I could inner join this somehow using it as a sub query of my main query but I cant seem to find a way to get it to work.
What I would like is to use the pkSDSID like above which is 50605 but use a column of a table and get the LastestSDS for each record.
I hope this makes sense I'm not all that great with SQL and I just don't know where to go from here.
Is this possible?
I appreciate all help. Thank you.
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