Selecting the Highest Seq Number by nested Joining - sql-server

Question

I would like to take biggest sequence number for each client Id (biggest sequence number will be calculated based on highest bank account balance).
This table has 100000 records.
Tables
ClientSeqTable T1
ClID SeqId
1 11
1 12
1 13
1 14
1 15
2 16
2 17
2 18
2 19
3 110
3 111
3 112
3 113
SeqBranchTable T2
SeqId BalID
11 1
12 2
13 3
14 4
15 5
16 6
17 7
18 8
19 9
110 10
111 11
112 12
113 13
Balancetable t3
BalID Balance
1 30000
2 26789
3 23456
4 12345
5 21234
6 12456
7 45632
8 23456
9 99999
10 12345
11 21234
12 12456
13 45632
Result would be
ClID SeqID Balance
1 1 30000
2 9 99999
3 4 45632
I have tried in this way but didn't work for me
SELECT RS.Investigationid,MAX(stt.sequenceid) 'SeqId', T.HighestBalance 'Balance'
FROM ClientSeqTable T1, SeqBranchTable T2, branbaltable t3,
( SELECT t1.clid ,MAX(T3.Balance) 'HighestBalance'
FROM ClientSeqTable T1, SeqBranchTable T2, branbaltable t3,
WHERE t1.seqid = T2.seqID
AND T2. balId= T3. balId
GROUP BY RS.Investigationid,stt.SequenceId
) T
WHERE T2.balId = T3.BalId
AND T1.SeqId = T2.SeqId
AND T3.HighestBalance = T2.balance
AND T1.clID = t.ClID
GROUP BY T1.ClID
With the above Query results are as below.
ClID SeqNu Bal
1 1 30000
1 2 30000
1 3 30000
1 4 30000
1 5 30000
2 3 99999
2 4 99999
2 1 99999
2 9 99999
3 2 45632
3 5 45632
3 3 45632
3 4 45632

Answer 1

If your able to use row_number function then should work:
select
*
from
(
select
t1.ClID, t1.SeqId, t3.Bal,
RowNumber = row_number() over (PARTITION BY t1.ClID order by t3.bal desc)
from
ClientSeqTable t1
inner join
SeqBranchTable t2 on t2.SeqId = t1.SeqId
inner join
Balancetable t3 on t3.BalID = t2.BalID
) t
where
t.RowNumber = 1
The important bit is row number partition by client id and then order by balance descending.

Answer 2

If you wanted to get your In-line on MAX you could do it this way
SELECT t1.ClID,
t1.SeqId,
t3.Balance
FROM ClientSeqTable t1
INNER JOIN SeqBranchTable t2
ON t2.SeqId = t1.SeqId
INNER JOIN Balancetable t3
ON t3.BalID = t2.BalID
INNER JOIN (SELECT Max(Balance) Bal,
t1.ClID
FROM ClientSeqTable t1
INNER JOIN SeqBranchTable t2
ON t2.SeqId = t1.SeqId
INNER JOIN Balancetable t3
ON t3.BalID = t2.BalID
GROUP BY t1.ClID) max_bal
ON t1.ClID = max_bal.ClID
AND t3.Balance = max_bal.bal
DEMO
But you should note this is not actually equivalent to using row_number (mouters solution). This may return multiple rows per ClID if there's a tie for max(balance). If you need that way of handling ties and you wanted to use a window function you could use RANK.