SQL Editor
Tables and Columns
Customer
- Id
(int)
- FirstName
(nvarchar)
- LastName
(nvarchar)
- City
(nvarchar)
- Country
(nvarchar)
- Phone
(nvarchar)
Order
- Id
(int)
- OrderDate
(datetime)
- OrderNumber
(nvarchar)
- CustomerId
(int)
- TotalAmount
(decimal)
OrderItem
- Id
(int)
- OrderId
(int)
- ProductId
(int)
- UnitPrice
(decimal)
- Quantity
(int)
Product
- Id
(int)
- ProductName
(nvarchar)
- SupplierId
(int)
- UnitPrice
(decimal)
- Package
(nvarchar)
- IsDiscontinued
(bit)
Supplier
- Id
(int)
- CompanyName
(nvarchar)
- ContactName
(nvarchar)
- ContactTitle
(nvarchar)
- City
(nvarchar)
- Country
(nvarchar)
- Phone
(nvarchar)
- Fax
(nvarchar)
Task:
List the monthly sales for the year 2013.
Partition the list into three equal parts (i.e. tertiles).
Click here
for details on
NTILE
.
SELECT MONTH(OrderDate) AS [Month], SUM(TotalAmount) AS 'Total Sales', NTILE(3) OVER(ORDER BY MONTH(OrderDate)) AS Tertile FROM [Order] WHERE YEAR(OrderDate) = 2013 GROUP BY MONTH(OrderDate)
12 Records
Month
Total Sales
Tertile
1
78757.60
1
2
41207.20
1
3
49476.70
1
4
55699.39
1
5
62642.70
2
6
39088.00
2
7
64663.83
2
8
49981.69
2
9
68093.57
3
10
70328.50
3
11
53999.51
3
12
77476.26
3
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