SQL command to get latest effective date

Question

Hi!
How can i want to write a sql command to fetch records as such
Vendor;    Item;     EffectiveDate;    UnitPrice;    Remarks
Vend1;      ABC;    31/01/2012;        120;            Dont show
Vend1;      ABC;    29/02/2012;        150;            Show
Vend2;      ABC;    01/01/2012;        140;            Show
Vend1;      XYZ;    15/01/2012;        100;            Show
Please help me, so far I can only figuire out how to get the latest effective date by vendor and item but was not able to get UnitPrice
SELECT  "VendPart"."Vendor", "VendPart"."Item", Max("VendPart"."EffectiveDate") AS MaxOfEffectiveDate
FROM   "POS_LiveRpt"."dbo"."VendPart" "VendPart"
GROUp BY "VendPart"."Vendor", "VendPart"."Item"
Edited by: MichellePoh on Feb 23, 2012 9:58 AM

Answer 1

hi Michelle,
you can use a subquery in your command to bring back the UnitPrice that is applicable to the max date...see the code below for an idea.
you'll have to change the "UnitPrice" field below to match yours.
note that in the subquery the vendpart table has been aliased as vendpart2 for the subquery to work. also note that the code may not work in your database as Alan aluded to the fact that the syntax is specific to the database type...if you get any database errors please refer to your database manual or a forum for your database type that has a subquery. and of course there may be errors from my typing in the query as it's just being done inside this forum thread...but hopefully this will give you an idea how to do this.
cheers,
jamie
SELECT 
"VendPart"."Vendor",
"VendPart"."Item",
Max("VendPart"."EffectiveDate") AS MaxOfEffectiveDate,
SELECT "VendPart2"."UnitPrice"
FROM "POS_LiveRpt"."dbo"."VendPart" "VendPart2"
WHERE "VendPart2"."EffectiveDate" = Max("VendPart"."EffectiveDate")
AND  "VendPart2"."Vendor" =  "VendPart"."Vendor"
AND "VendPart2"."Item" = "VendPart"."Item"
) AS UnitPrice
FROM  
"POS_LiveRpt"."dbo"."VendPart" "VendPart"
GROUp BY
"VendPart"."Vendor", "VendPart"."Item"