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:
Before deleting duplicates you have to find them.
Duplicates are identified using a CTE on the Order table.
Click here
for details on
Duplicates
.
WITH Cte(FirstName, LastName, OrderDate, RowNumber) AS ( SELECT FirstName, LastName, OrderDate, ROW_NUMBER() OVER ( PARTITION BY OrderDate, FirstName, LastName ORDER BY OrderDate, FirstName, LastName) AS RowNumber FROM [Order] O JOIN Customer C ON C.Id = O.CustomerId ) SELECT * FROM Cte WHERE RowNumber > 1
No records were found.
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in Austin, Texas. Vsn 1.3.0