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Introduction
Quick Refresher
PARTITION BY ORDER BY with Ranking
PARTITION BY ORDER BY with Window Frames
Using PARTITION BY ORDER BY with Analytical Functions
18. Practice Time!
Summary and Review

## Instruction

Okay, let's practice using PARTITION BY ORDER BY with analytic functions!

## Exercise

For each row of sales figures, show the following information: StoreId, Day, Revenue, the Revenue from seven days before (LastWeekRevenue), and the Ratio of today's revenue to last week's revenue. This ratio should be expressed as a percentage with two decimal places.

### Stuck? Here's a hint!

Use, among others:

LAG(Revenue,7) OVER(PARTITION BY StoreId ORDER BY Day ASC)