Join to only the “latest” record with t-sql

Question

I\'ve got two tables. Table \"B\" has a one to many relationship with Table \"A\", which means that there will be many records in table \"B\" for one record in table \"A\".<

Answer 1

With ABDateMap AS (
    SELECT Max(RowDate) AS LastDate, TableAID FROM TableB GROUP BY TableAID
),
LatestBRow As (
    SELECT MAX(ID) AS ID, TableAID FROM ABDateMap INNER JOIN TableB ON b.TableAID=a.ID AND b.RowDate = LastDate GROUP BY TableAID
)
SELECT columns
FROM TableA a
INNER JOIN LatestBRow m ON m.TableAID=a.ID
INNER JOIN TableB b on b.ID = m.ID