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Part 4 Delete duplicate rows in sql

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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
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DELETE DUPLICATE ROWS FROM A TABLE IN SQL || 4 ways

In today's video, we'll learn how to delete duplicate rows from a table in SQL.
4 following ways are shown:
1) remove duplicate rows using a temporary table
2) remove duplicate rows using auto ID
3) remove duplicate rows using row_number()
4) remove duplicate rows using CTE

Thank you!
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How to Delete Duplicate records in sqlserver part 4

How to Delete Duplicate records in sqlserver
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How to Delete Duplicate records(rows) in SQL Server

This video shows to find duplicate records and how to delete Duplicate records in a table.This video explains , best 5 methods to delete duplicate records in table.In this way we can maintain Accuracy and consistence of data data in Database .

how to delete duplicate rows in Sql server?

It is the very common interview question .Please watch full video for more detail.Please find script below,
How to duplicate Rows in table ?

How To Delete Duplicate Rows In Sql Server

How to delete duplicate rows in SQL Server.

This video shows how you can delete duplicate rows in SQL server without deleting the original record using CTE(Common Table Expression).

Script download link::

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SQL Server Delete Duplicate Rows Simple Example

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A common table expression (CTE) can be thought of as a temporary result set that is defined within the execution scope of a single SELECT, INSERT, UPDATE, DELETE, or CREATE VIEW statement. A CTE is similar to a derived table in that it is not stored as an object and lasts only for the duration of the query. Unlike a derived table, a CTE can be self-referencing and can be referenced multiple times in the same query

SQL Tutorial : How To Delete Duplicate Records in SQL Oracle

SQL Tutorial : How To Delete Duplicate Records in SQL Oracle
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Delete Duplicate rows in sql (Simple Way)

Delete Duplicate rows in sql rows
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Identify and Delete Duplicate records (rows) - SQL Server

Identify and Delete Duplicate records/rows.

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How to delete duplicate records from SQL Server

This video is a step by step process of writing a query to remove duplicates in a SQL Server table.

Delete duplicate rows in SQL Server Tamil

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A common table expression (CTE) can be thought of as a temporary result set that is defined within the execution scope of a single SELECT, INSERT, UPDATE, DELETE, or CREATE VIEW statement. A CTE is similar to a derived table in that it is not stored as an object and lasts only for the duration of the query. Unlike a derived table, a CTE can be self-referencing and can be referenced multiple times in the same query

SQL CTE Examples | SQL Delete Duplicate Rows | Identify duplicate rows in sql server

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Q: How to delete a duplicate records from a table?
A:
Table name = employee
There are 3 fields in employee table.
id, name, salary

If name and salary of an employee are equal then employee is duplicate then self join used in employee table to delete duplicate records.

SQL query || SQL interview queries || helpumyway
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How to delete duplicate rows in SQL

How to delete duplicate rows in SQL

Delete duplicate rows in sql | sql server interview question and answer | sql interview part 18

How to delete duplicate records when duplicate values are based on multiple columns
reverse Delete duplicate rows in sql

MySQL Tutorial 1 - Remove Duplicate Rows from MySQL Table

How to remove duplicate rows from a MySQL database table. The process should be similar for other kinds of databases I imagine.

Anthony Vipond is a senior software developer and the founder of Winterwind Software Services, a software development agency in the Philippines. Have your website, app or blockchain application developed by Anthony and his team by emailing him at anthony[at]winterwind.com. Learn more about Winterwind at

Delete Duplicates in SQL - SQL Training Online

Delete Duplicates in SQL Server - SQL Training Online

In this video, I show you two different techniques to remove duplicate records in a SQL Server 2012 table.

I don't use the SQL distinct operators, but I actually group the data and apply unique row identifiers to make the SQL delete easier.

Both of the SQL delete statements involve SQL Server CTE statements and use the Row_Number operator to assist in the process. With the operator, you can identify the duplicate rows

You can get the sample script to run the test yourself at

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SQLServer - How to delete duplicate record's from table

SQLServer - How to delete duplicate record's / row's from table

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