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

select a.*, bm.MaxRowDate
from (
    select TableAID, max(RowDate) as MaxRowDate
    from TableB
    group by TableAID
) bm
inner join TableA a on bm.TableAID = a.ID

If you need more columns from TableB, do this:

select a.*, b.* --use explicit columns rather than * here
from (
    select TableAID, max(RowDate) as MaxRowDate
    from TableB
    group by TableAID
) bm
inner join TableB b on bm.TableAID = b.TableAID
    and bm.MaxRowDate = b.RowDate
inner join TableA a on bm.TableAID = a.ID