SQL Editor
SQL Lag 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 prior month's sales.
If there is no prior month, return 0. Also include the delta (difference) between the current and the prior month's sales.
Click here
for details on
LAG
.
SELECT MONTH(OrderDate) AS [Month], SUM(TotalAmount) AS Sales, LAG(SUM(TotalAmount), 1, 0) OVER(ORDER BY MONTH(OrderDate)) AS 'Previous Month', SUM(TotalAmount) - LAG(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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