T-SQL Subquery Max(Date) and Joins

Question

I'm trying to join multiple tables, but one of the tables has multiple records for a partid with different dates. I want to get the record with the most recent date.

Here are some example tables:

Table: MyParts Partid   Partnumber   Description 1        ABC-123      Pipe 2        ABC-124      Handle 3        ABC-125      Light   Table: MyPrices Partid   Price        PriceDate 1        $1           1/1/2005 1        $2           1/1/2007 1        $3           1/1/2009 2        $2           1/1/2005 2        $4           1/1/2006 2        $5           1/1/2008 3        $10          1/1/2008 3        $12          1/1/2009 

If I was just wanted to find the most recent price for a certain part I could do:

SELECT * FROM MyPrice WHERE PriceDate = (SELECT MAX(PriceDate)  FROM MyPrice WHERE Partid = 1) 

However I want to do a join first and get back the correct price for all parts not just one. This is what I have tried:

SELECT * FROM MyParts LEFT JOIN MyPrice ON MyParts.Partid = MyPrice.Partid WHERE  MyPart.PriceDate = (SELECT MAX(PriceDate) FROM MyPrice) 

The results are wrong as it takes the highest price date of the entire table.

SELECT * FROM MyParts LEFT JOIN MyPrice ON MyParts.Partid = MyPrice.Partid WHERE  MyPart.PriceDate = (SELECT MAX(PriceDate) FROM MyPrice WHERE MyPrice.Partid =    MyParts.Partid) 

That errors out.

What can I do to get the results I want.

Answer 1

Here's another way to do it without subqueries. This method will often outperform others, so it's worth testing both methods to see which gives the best performance.

SELECT      PRT.PartID,      PRT.PartNumber,      PRT.Description,      PRC1.Price,      PRC1.PriceDate FROM      MyParts PRT LEFT OUTER JOIN MyPrices PRC1 ON      PRC1.PartID = PRT.PartID LEFT OUTER JOIN MyPrices PRC2 ON      PRC2.PartID = PRC1.PartID AND      PRC2.PriceDate > PRC1.PriceDate WHERE      PRC2.PartID IS NULL 

This will give multiple results if you have two prices with the same EXACT PriceDate (Most other solutions will do the same). Also, I there is nothing to account for the last price date being in the future. You may want to consider a check for that regardless of which method you end up using.