PARTITION BY ORDER BY with Ranking
PARTITION BY ORDER BY with Window Frames
Using PARTITION BY ORDER BY with Analytical Functions
Instruction
Nice work!
In part 5, you got to know window frames. Can we use them with PARTITION BY to create even more sophisticated windows? Of course we can. Take a look:
SELECT Id, Country, City, OpeningDate, Rating, MAX(Rating) OVER(PARTITION BY Country ORDER BY OpeningDate ASC ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS MaxRating FROM Store;
In the above example, we show some information about each store and the maximal rating of any store opened up to that date (that's where we need a window frame) in the respective country (that's where we need PARTITION BY).
Exercise
Show sales statistics between August 1 and August 7, 2016. For each row, show the StoreId, Day, the Revenue, and the highest revenue in that store up to that date. Name the column CurrentMaxRevenue.
Stuck? Here's a hint!
Use:
ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
