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Introduction
Get to know the database
Basic revenue metrics
Summary

## Instruction

Good job! Now, let's introduce some time constraints to our revenue reports. Take a look:

SELECT
C.CustomerId,
CompanyName,
SUM(Amount) AS TotalRevenue
FROM Orders O
JOIN Customers C
ON O.CustomerId = C.CustomerId
WHERE O.OrderDate >= '20170301' AND O.OrderDate < '20170401'
GROUP BY C.CustomerId,
CompanyName;


The query above shows total revenue per customer, but this time it's based on orders from March 2017. We've added a WHERE clause, inside which we defined the range for OrderDate. Note the date format that we used: YYYYMMDD. In other words, O.OrderDate >= '20170301' means 'orders placed on March 1, 2017 or later'. Note that the month comes before the day in this date format – this might be counterintuitive for people from the US. The other condition that we used is O.OrderDate < '20170401', which means "orders placed before April 1, 2017".

## Exercise

Find the TotalRevenue (the sum of all amounts) from all orders placed in 2017.

### Stuck? Here's a hint!

You need the following condition in the WHERE clause:

OrderDate >= '20170101' AND OrderDate < '20180101'