SQL Editor
SQL Lead Partition Example
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 monthly sales for the year 2013. For each month include next month's sales.
If there is no prior month, return 0. Also include the delta (difference) between the current and the next month's sales.
Click here
for details on
LEAD
.
SELECT MONTH(OrderDate) AS [Month], SUM(TotalAmount) AS Sales, LEAD(SUM(TotalAmount), 1, 0) OVER(ORDER BY MONTH(OrderDate)) AS 'Next Month', SUM(TotalAmount) - LEAD(SUM(TotalAmount), 1, 0) OVER(ORDER BY MONTH(OrderDate)) AS Delta FROM [Order] WHERE YEAR(OrderDate) = 2013 GROUP BY MONTH(OrderDate)
No records were found.
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