Return one SQL row per product with price and latest date

Question

I am not a SQL guy, I have used it in the past and rarely have an issue that cant be solved by google... however this time I need to ask the Community.

I have a database

Answer 1

You can use a CTE and the ranking function PARTITION BY:

WITH CTE AS
(
    select t.ProdNo, t.TransactionDate as 'LastPurchaseDate', t.Price,
           rn = row_number() over (partition by ProdNo order by TransactionDate desc)
    from Transactions t
)
SELECT ProdNo, LastPurchaseDate, Price  FROM CTE WHERE RN = 1