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9.3

Help in creating a query....

Asked by imarshad in Oracle Database, Microsoft Access Database, Oracle 9.x

I need to fetch data from two tables(Vehicles, VData) in my database using the following criterion.
Vehicles table has fields (UnitID, vNo, vName) UnitID is Primary key and is unique for each record.
VData table has fields (UnitID, TimeDate, value1, value2) There are multiple records with same UnitID in this table.

Now I want to select the following
Each Unique UnitID in VData that is also present in Vehicles table and also its last record(Latest TimeDate value) from VData.

Part I of this query is easy i.e "Each Unique UnitID in VData that is also present in Vehicles table"

This can be simply done by using the following query
Select Vehicles.UnitID, Vehicles.vNo, Vehicles.vName from Vehicles where Vehicles.UnitID IN ( Select Distinct UnitID from VData)

But I am stuck as how to fetch the latest record for each UnitID in VData table.


Backend database Oracle 9i
Frontend VB6 and ADO

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Sample Data and expected results......
Vehicles Table
UnitID     vNo       vName
 1001      a1         xyz
 1002      a2         xyz
 1003      a3         xyz 
 1004      a4         xyz  
 1005      a5         xyz
 
VData Table
 
UnitID        TimeDate              value1    value2
 1001     2009/04/22 10:23           (Irrelevant)
 1001     2009/04/22 10:20           (Irrelevant)
 1003     2009/04/22 11:23           (Irrelevant)
 1003     2009/04/22 12:29           (Irrelevant)
 1004     2009/04/22 11:50           (Irrelevant)
 1004     2009/04/22 10:14           (Irrelevant)
 1004     2009/04/22 06:59           (Irrelevant)
 1004     2009/04/20 02:23           (Irrelevant)
 1006     2009/04/22 12:403          (Irrelevant)
 
Expected results after running the query.....
 
1001      a1         xyz      2009/04/22 10:23   value1    value2
1003      a3         xyz      2009/04/22 12:29   value1    value2
1004      a4         xyz      2009/04/22 11:50   value1    value2
[+][-]04/22/09 11:41 PM, ID: 24212261Expert Comment

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[+][-]04/22/09 11:43 PM, ID: 24212272Expert Comment

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Zones: Oracle Database, Microsoft Access Database, Oracle 9.x
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Solution Provided By: nav_kum_v
Participating Experts: 4
Solution Grade: A
 
[+][-]04/27/09 01:44 AM, ID: 24239809Assisted Solution

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[+][-]04/27/09 01:45 AM, ID: 24239810Expert Comment

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[+][-]04/27/09 01:54 AM, ID: 24239848Author Comment

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