SQL Server 2014 : how to get records that have rows of different values of only particular column

Question

Our customers have accounts with us for their vehicles. Some customers have multiple vehicles, hence multiple licence plates. Sometimes, some customers have different Insurance Accounts for their vehicles too.

I need a list of accounts that have:

1. More than 1 licence plate and
2. More than 1 insurance account ID

I'm using 3 tables:

• Account table A for account info
• Plate table P for licence plate info
• EventLog table E for info when notice letter was sent

Relationship:

A.AccountId = P.AccountId = E.AccountId

My code so far:

SELECT 
    A.AccountNumber, A.AccountId, A.CurrentBalance,
    E.NotificationDt,
    P.LicPlateNo, A.RegistrationTypeId, P.InsuranceAccountId
FROM 
    Account A
INNER JOIN 
    Plate P ON A.AccountId = P.AccountId
INNER JOIN  
    EventLog E ON A.AccountId = E.AccountId
WHERE 
    A.RegistrationTypeId = 3
    AND P.EndDate IS NULL               
    AND A.AccountStatusId = 1           
    AND A.DelinquencyStatusId = 11
    AND E.EventId = 64
    AND P.PlateStatusId = 1
ORDER BY 
    AccountNumber, A.AccountId, P.LicPlateNo

My sample data looks like this:

+---------+---------+---------+-------------+----------+---+--------+
|AccNo    | AccId   |CurrBal  |NotifDt      |LicPlateNo|RTI|InsAccId|
+---------+---------+---------+-------------+----------+---+--------+
|21234561 |123456   |    56.79|   2017-01-01|ABC123    |  3|1234ABC |
|21234572 |123457   |    83.25|   2017-01-03|DEF345    |  3|345DEF  |
|22345672 |234567   |   104.38|   2017-01-03|GHI345    |  3|567GHI  |
|22345672 |234568   |   104.38|   2017-01-03|JKL678    |  3|789MNO  |
+---------+---------+---------+-------------+----------+---+--------+

In my sample data, the last two columns are for the same AccountNumber which has different LicencePlateNos and different Insurance AccountIds .

I would like my data to look like this:

+---------+---------+---------+-------------+----------+---+--------+
|22345672 |234567   |   104.38|   2017-01-03|GHI345    |  3|567GHI  |
|22345672 |234568   |   104.38|   2017-01-03|JKL678    |  3|789MNO  |
+---------+---------+---------+-------------+----------+---+--------+

What would the code be that would give me that data?

I tried using a GROUP BY... HAVING clause but that gives me only the unique AccountNumber s that have multiple licence plates. I would like to show the different licence plate nos and the different InsuranceAccountID s as well.

Answer 1

A simple way is to use your query as a base and count the values with more than one row:

SELECT a.*
FROM (SELECT A.AccountNumber, A.AccountId, A.CurrentBalance, E.NotificationDt,
             P.LicPlateNo, A.RegistrationTypeId, P.InsuranceAccountId,
             COUNT(*) OVER (PARTITION BY A.AccountNumber) as cnt
      FROM Account A INNER JOIN
           Plate P
           ON A.AccountId = P.AccountId INNER JOIN
           EventLog E
           ON A.AccountId = E.AccountId
      WHERE A.RegistrationTypeId = 3 AND
            P.EndDate IS NULL AND  
            A.AccountStatusId = 1 AND        
            A.DelinquencyStatusId = 11 AND
            E.EventId = 64 AND
            P.PlateStatusId = 1
     ) a
WHERE cnt > 1;   
ORDER BY AccountNumber, AccountId, LicPlateNo;

Answer 2

An easy way to do this would be to JOIN a result set that would allow you for checking for either or both conditions. Just include the appropriate filter clause:

...
INNER JOIN EventLog E ON A.AccountId = E.AccountId

INNER JOIN
(
    SELECT
        Plate.AccountId,
        LicensePlateCount = COUNT(DISTINCT Plate.LicPlateNo),
        InsuranceAccountCount = COUNT(DISTINCT Plate.InsuranceAccountId)
    FROM
        Plate
    WHERE
        Plate.EndDate IS NULL
        AND Plate.PlateStatusId = 1
    GROUP BY
        Plate.AccountId
) PlateAccounts ON A.AccountId = PlateAccounts.AccountId
    -- 1) More than 1 License Plate:
    AND PlateAccounts.LicensePlateCount > 1
    -- 2) More than 1 Insurance Account IDs:
    AND PlateAccounts.InsuranceAccountCount > 1

WHERE A.RegistrationTypeId = 3
...