Simple join question - my query is returning unwanted rows ...

Question

My SQL select is returning more rows that I want it to return. The table that I'm joining on has multiple rows per CaseId, and I'm only interested in getting one...
table1
CaseId     column1     column2
8     elmo          foz
9     foo          bar
10     fuz          baz
11     fuy          bay
table2
CaseId     Seq     column8     column9
8     1     choc          strawberry
9     1     banana          orange
9     2     do          re
10     1     me          fa
So a SQL select like:
select t1.CaseId, t1.column1, t1.column2, t2.column8
FROM table1 t1 LEFT OUTER JOIN table2 t2
ON t1.CaseId = t2.CaseId
returns data like:
t1.CaseId     t1.column1     t1.column2     t2.column8
8          elmo          foz          choc
9          foo          bar          banana
9          fuz          baz          do
I want the SQL select to return only one row for each row that’s in table1; CaseId of 9 should have only one row in the SQL select results.
The table2 has multiple rows, because of the Seq column. How can I formulate the SQL select to join on table2 using CaseId and the max Seq value?
Thank you!

Answer 1

Untested..
with t1 AS
        (SELECT *
           FROM (SELECT table2.*,
                        ROW_NUMBER ()
                           OVER (PARTITION BY caseid ORDER BY seq DESC)
                           r
                   FROM table2)
          WHERE r = 1)
SELECT t1.CaseId,
       t1.column1,
       t1.column2,
       t2.column8
  FROM table1 t1 LEFT OUTER JOIN t1 t2 ON t1.CaseId = t2.CaseId;OUTPUT:
CASEID     COLUMN1     COLUMN2     COLUMN8
8     elmo     foz     choc
9     foo     bar     do
10     fuz     baz     me
11     fuy     bay     Cheers,
Manik.