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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

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

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 .
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How to delete duplicate rows in sql | Identify duplicate rows in sql server

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Part of
SQL Server interview questions and answers
sq server tutorials

Identify and Delete Duplicate records (rows) - SQL Server

Identify and Delete Duplicate records/rows.

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How To Delete Duplicate Rows In MySQL phpMyAdmin 4 7 9

#rowsdeleteduplicate #mysqldeleterowsduplicate

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HOW TO IDENTIFY AND DELETE DUPLICATE ROWS USING ROWID AND GROUPBY IN ORACLE SQL

This video demonstrates examples on how to find and delete duplicate records from a table. The video gives simple and easy to understand examples on finding duplicate records from a table using group by and having clause and row_number function. It also shows the ways in which duplicates can be deleted very efficiently using the rowid of that record.

You can get the code from our website

How to delete duplicate rows in SQL

How to delete duplicate rows in SQL
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Delete Duplicate rows in sql (Simple Way)

Delete Duplicate rows in sql rows

SQL - Removing duplicate records using ROWID pseudo column

How to remove duplicate records from a table using the pseudo column rowid.
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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 ?

Remove duplicate records in mysql query

If you have any problem and any Query, then comment uder the video I will try to, provide best solution as soon As possible
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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.
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SQL CTE Examples | SQL Delete Duplicate Rows | Identify duplicate rows in sql server

Video talks about
how to write SQL CTE with examples
Common table expressions in SQL server
CTE examples in SQL server
How to delete duplicate rows in sql server
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Row Number in SQL server
Common table expression with examples

Partition in SQL server
Order By in SQL server

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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::

Text Article on this topic :


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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

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

delete duplicate rows in sql

how to delete duplicate record in sql databse.

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