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Maximum Record Selection

Posted on 2013-06-26
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Last Modified: 2013-06-28
I have a table:

Product

This table is linked to another table:

Product Price

This table contains:
Price Date
Price

I need to be able to select the latest price for a product.
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Question by:whittinga2
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8 Comments
 
LVL 101

Expert Comment

by:mlmcc
ID: 39277961
You are going to have to use a view/stored procedure in the database or a Crystal command

mlmcc
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LVL 101

Expert Comment

by:mlmcc
ID: 39278011
The query will be something like

SELECT Product.ID, Product.Description, ...
(SELECT Price.Price  FROM Price WHERE Price.ProductID = Product.ID AND Price.PriceDate = Maximum(Price.PriceDate)
FROM Product

mlmcc
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Assisted Solution

by:mlmcc
mlmcc earned 1000 total points
ID: 39278547
Error in the SQL

SELECT Product.ID, Product.Description, ...
(SELECT Price.Price  FROM Price WHERE Price.ProductID = Product.ID AND Price.PriceDate = (SELECT Maximum(Price.PriceDate) FROM Price WHERE Price.ProductID = Product.ID ))
FROM Product

mlmcc
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LVL 35

Expert Comment

by:James0628
ID: 39280779
FWIW, you _could_ find the most recent price in a report, but it would probably be much more efficient to do it in the db query, as mlmcc suggested.  It would depend a lot on your data and the report, and what you wanted to do with that price (just display it, or use it in calculations).

 James
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Author Comment

by:whittinga2
ID: 39283648
Cheers fellas. I will give it a go and get back to you.

Sorry for the delay.
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Author Comment

by:whittinga2
ID: 39283730
Any idea why I've been given a syntax error?

SELECT *
(SELECT * FROM pricehistory WHERE pricehistory.productid = productdetails.productid AND pricehistory.priceeffectivefromdate =
(SELECT Maximum(pricehistory.priceeffectivefromdate) FROM pricehistory WHERE pricehistory.productid = productdetails.productid))
FROM productdetails
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LVL 35

Accepted Solution

by:
James0628 earned 1000 total points
ID: 39283816
The subquery was meant to pull in the latest price (_only_ the price), and that would become another column in the main query.  You have "(SELECT * FROM pricehistory ...", so you're pulling in all of the columns from pricehistory.

 So, that should be

(SELECT your_price_column FROM pricehistory WHERE <etc.>


 If you could have more than one entry in pricehistory with the same date, then you should use something like TOP 1, to make sure that the subquery only returns one value:

(SELECT TOP 1 your_price_column FROM pricehistory WHERE <etc.>

 OTOH, if priceeffectivefromdate is a datetime, then that probably won't happen.  But I wanted to mention it anyway, just in case.


 You probably also want to set a name for that subquery column.

 And you need a "," at the end of the first line, to separate the other columns (*) and the subquery column.

 So, putting all of that together, maybe something like this:

SELECT *,
(SELECT your_price_column FROM pricehistory WHERE pricehistory.productid = productdetails.productid AND pricehistory.priceeffectivefromdate =
(SELECT Maximum(pricehistory.priceeffectivefromdate) FROM pricehistory WHERE pricehistory.productid = productdetails.productid)) AS latest_price
FROM productdetails


 Obviously, replace your_price_column with the actual column name.  And you can add the TOP 1 if you need it.

 James
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Author Closing Comment

by:whittinga2
ID: 39283859
Thanks to both of you. Points allocated.
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