SQL Server 2008 Select and Filtering data

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I have 3 tables

1 for Vehicles

SQL

VehicleId
Code

1 for Oweners

SQL

OwnerId
Name

1 for Vehicle Owner History

SQL

VehicleId
OwenerId
OwnedFromDate

What I need to do is get a list of every vehicle and who owned the vehicle on a date specifed by the user e.g. TOP 1 for each vehicle WHERE OwnedFromDate <=
Specified Date ORDER BY OwnedFromDate DESCending.

SQL

SELECT  TOP 1  dbo.Owners.HaulierId, dbo.Vehicles.VehicleId, dbo.Vehicles.Code, dbo.Owners.Name, dbo.VehicleOwnershipHistory.OwnedFromDate
FROM         dbo.VehicleOwnershipHistory INNER JOIN
                      dbo.Vehicles ON dbo.VehicleOwnershipHistory.VehicleId = dbo.Vehicles.VehicleId INNER JOIN
                      dbo.Haulier ON dbo.VehicleOwnershipHistory.OwnerId = dbo.Owner.HaulierId
WHERE dbo.VehicleOwnershipHistory.OwnedFromDate <= @Date
ORDER BY dbo.VehicleOwnershipHistory.OwnedFromDate DESC

Posted 18-Oct-11 4:40am

Steven J Jowett

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kiran dangar 19-Oct-11 2:01am

I guess the problem is multiple records for the same Date...

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kiran dangar · Accepted Answer · 2011-10-18T20:17:00

Hi, RANK() might be useful in this scenario.

Please try below query..

SQL

SELECT
    dbo.Owners.HaulierId,
    dbo.Vehicles.VehicleId,
    dbo.Vehicles.Code,
    dbo.Owners.Name,
    dbo.VehicleOwnershipHistory.OwnedFromDate,
    RANK() over(partition by dbo.VehicleOwnershipHistory.OwnedFromDate order by dbo.Owners.HaulierId) Rnk
FROM dbo.VehicleOwnershipHistory
    INNER JOIN dbo.Vehicles
        ON dbo.VehicleOwnershipHistory.VehicleId = dbo.Vehicles.VehicleId
    INNER JOIN dbo.Haulier
        ON dbo.VehicleOwnershipHistory.OwnerId = dbo.Owner.HaulierId

WHERE dbo.VehicleOwnershipHistory.OwnedFromDate <= @Date
    and Rnk = 1
ORDER BY dbo.VehicleOwnershipHistory.OwnedFromDate DESC

From your query i have removed top 1 and used

SQL

RANK() over(partition by dbo.VehicleOwnershipHistory.OwnedFromDate order by dbo.Owners.HaulierId) Rnk

and put a condition to fetch the data with only First Rank

SQL

Where Rnk = 1

Hope this will help..