SQL Editor
SQL Delete Duplicates 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:
The duplicate rows need deletion using DELETE query.
Click here
for details on
Duplicates
.
WITH Cte(Id, CustomerId, OrderDate, RowNumber) AS ( SELECT Id, CustomerId, OrderDate, ROW_NUMBER() OVER ( PARTITION BY CustomerId, OrderDate ORDER BY OrderDate, CustomerId) AS RowNumber FROM [Order] O ) DELETE FROM Cte WHERE RowNumber > 1
Command ran successfully
Note
: the changes were rolled back (undone)
to maintain the integrity of the database.
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in Austin, Texas. - vsn 44.0.0