Re: Need to find last price and date product was sold

[João Cândido de Souza Neto]

select product_code, max(date_sold), price_sold from trans group by 
product_code order by product_code



"mos" <mos99@stripped> escreveu na mensagem 
news:6.0.0.22.2.20060927230926.0353a8f8@ style="color:#666">stripped...
> This should be easy but I can't find a way of doing it in 1 step.
>
> I have a Trans table like:
>
> Product_Code: X(10)
> Date_Sold: Date
> Price_Sold: Float
>
> Now there will be 1 row for each Product_Code, Date combination. So over 
> the past year a product_code could have over 300 rows, one row for each 
> day it was sold. There are thousands of products.
>
> What I need to do is find the last price_sold for each product_code. Not 
> all products are sold each day so a product might not have been sold for 
> weeks.
>
> The only solution I've found is to do:
>
> drop table if exists CurrentPrices;
> create table CurrentPrices select Prod_Code, cast(max(Date_Sold) as 
> Date), -1.0 Price_Sold from Trans group by Prod_Code;
> alter table CurrentPrices add index ix_ProdCode (Prod_Code);
> update CurrentPrices CP, Trans T set CP.Price_Sold=T.Price_Sold and 
> T.Date_Sold=CP.Date_Sold;
>
> Is there a way to shorten this? It may take 2-3 minutes to execute. I 
> don't really need a new table as long as I get the Prod_Code and the last 
> Date_Sold.
>
> TIA
> Mike