tabletop simulator Part 4 Delete duplicate rows in sql

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In this video, we will discuss deleting all duplicate rows except one from a sql server table.

SQL Script to create Employees table
Create table Employees
(
ID int,
FirstName nvarchar(50),
LastName nvarchar(50),
Gender nvarchar(50),
Salary int
)
GO

Insert into Employees values (1, 'Mark', 'Hastings', 'Male', 60000)
Insert into Employees values (1, 'Mark', 'Hastings', 'Male', 60000)
Insert into Employees values (1, 'Mark', 'Hastings', 'Male', 60000)
Insert into Employees values (2, 'Mary', 'Lambeth', 'Female', 30000)
Insert into Employees values (2, 'Mary', 'Lambeth', 'Female', 30000)
Insert into Employees values (3, 'Ben', 'Hoskins', 'Male', 70000)
Insert into Employees values (3, 'Ben', 'Hoskins', 'Male', 70000)
Insert into Employees values (3, 'Ben', 'Hoskins', 'Male', 70000)

The delete query should delete all duplicate rows except one.

Here is the SQL query that does the job. PARTITION BY divides the query result set into partitions.
WITH EmployeesCTE AS
(
SELECT *, ROW_NUMBER()OVER(PARTITION BY ID ORDER BY ID) AS RowNumber
FROM Employees
)
DELETE FROM EmployeesCTE WHERE RowNumber ] 1

tabletop simulator Part 4 Delete duplicate rows in sql
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Education	Upload TimePublished on 29 May 2014

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