Self join issue - sql

Question

I have a table called tblAccInfo, below is the table data.
I need output like below.
Input
PolicyNumber BankAc StorageDate VerNum
6003210400 123 2012-01-01 1
6003210400 164 2012-01-03 2
6003210400 860 2012-01-05 3
6004317654 301 2012-02-05 1
6004317654 615 2012-03-01 2
6004317654 253 2012-03-12 3
6004317654 887 2012-04-03 4
OUTPUT
PolicyNumber IntialBankAc IntialSDate VerNum LatestBankAc LatestSDate VerNum
6003210400 123 2012-01-01 1 860 2012-01-05 3
6004317654 301 2012-02-05 1 887 2012-04-03 4
I have tried with below self join, but did not succeeded. Please help me out in this.
Select DISTINCT
P.PolicyNumber,
P.BankAc [IntialBankAc],
P.StorageDate IntialSDate],
P.VerNum,
P1.BankAc [LatestBankAc],
P1.StorageDate [LatestSDate],
P1.VerNum
FROM tblAccInfo P
INNER JOIN tblAccInfo P1
ON P1.PolicyNumber=P.PolicyNumber
AND (P.BankAc<>P1.BankAc AND P.StorageDate<>P1.StorageDate AND P.VerNum<>P1.VerNum)

Answer 1

Try this:
SELECT
T1.PolicyNumber,
T2.BankAc AS IntialBankAc,
T2.StorageDate AS IntialSDate,
T2.VerNum AS InitalVerNum,
T3.BankAc AS LatestBankAc,
T3.StorageDate AS LatestSDate,
T3.Vernum AS LatestVerNum
FROM
(
SELECT
PolicyNumber,
MIN(VerNum) AS MinVerNum,
MAX(VerNum) AS MaxVerNum
FROM tblAccInfo
GROUP BY PolicyNumber
) AS T1
JOIN tblAccInfo AS T2
ON T1.PolicyNumber = T2.PolicyNumber
AND T1.MinVerNum = T2.VerNum
JOIN tblAccInfo AS T3
ON T1.PolicyNumber = T3.PolicyNumber
AND T1.MaxVerNum = T3.VerNum
See it working online: sqlfiddle

Answer 2

DECLARE #x TABLE
(
PolicyNumber VARCHAR(32),
BankAc INT,
StorageDate DATE,
VerNum INT
);
INSERT #x VALUES
('6003210400','123','2012-01-01',1),
('6003210400','164','2012-01-03',2),
('6003210400','860','2012-01-05',3),
('6004317654','301','2012-02-05',1),
('6004317654','615','2012-03-01',2),
('6004317654','253','2012-03-12',3),
('6004317654','887','2012-04-03',4);
WITH x AS
(
SELECT PolicyNumber, BankAc, StorageDate, VerNum,
f = ROW_NUMBER() OVER (PARTITION BY PolicyNumber ORDER BY VerNum),
l = ROW_NUMBER() OVER (PARTITION BY PolicyNumber ORDER BY VerNum DESC)
FROM #x
)
SELECT
x.PolicyNumber,
InitialBankAc = x.BankAc,
InitialSDate = x.StorageDate,
InitialVerNum = x.VerNum,
LatestBankAc = x2.BankAc,
LatestSDate = x2.StorageDate,
LatestVerNum = x2.VerNum
FROM x INNER JOIN x AS x2
ON x.PolicyNumber = x2.PolicyNumber
WHERE x.f = 1 AND x2.l = 1
ORDER BY x.PolicyNumber;

Answer 3

not tested - but should give you the idea. (There may be a more efficient way of doing this - it was just the approach that jumped out at me.)
select initial.policynumber
,initial.initialbankaccoutn
,initial.initialstoragedate
,initial.intialvernum
,final.latestbankaccount
,final.lateststoragedate
,final.latestvernum
from
(select a.policynumber, a.bankaccount as initialbankaccount, a.storagedate as initialstoragedate, a.vernum as initialvernum
from tblAccInfo a1
inner join (select min(storagedate) as storagedate, policynumber
from tblAccInfo
group by policynumber) a
on a.policynumber = a1.policynumber
and a.storagedate = a1.storagedate) initial
inner join
(select b.policynumber, b.bankaccount as latestbankaccount, b.storagedate as lateststoragedate, b.vernum as latestvernum
from tblAccInfo b1
inner join (select min(storagedate) as storagedate, policynumber
from tblAccInfo
group by policynumber) b
on a.policynumber = b1.policynumber
and a.storagedate = b1.storagedate) final
on final.policynumber = initial.policynumber