First, the CTE uses the ROW_NUMBER() function to find the duplicate rows specified by values in the first_name, last_name, and email columns.The following statement uses a common table expression ( CTE) to delete duplicate rows: WITH cte AS ( Delete duplicate rows from a table example There are many duplicate rows (3,4,5), (6,7), and (8,9) for the contacts that have the same first name, last name, and email.
The following picture shows the output of the query: ntacts Code language: SQL (Structured Query Language) ( sql ) Third, query data from the ntacts table: SELECT ( 'Syed', 'Abbas', 'Catherine', 'Abel', 'Kim', 'Abercrombie', 'Kim', 'Abercrombie', 'Kim', 'Abercrombie', 'Hazem', 'Abolrous', 'Hazem', 'Abolrous', 'Humberto', 'Acevedo', 'Humberto', 'Acevedo', 'Pilar', 'Ackerman', language: SQL (Structured Query Language) ( sql ) Second, insert some rows into the ntacts table: INSERT INTO ntacts Setting up a sample tableįirst, create a new table named ntacts as follows: DROP TABLE IF EXISTS ntacts Ĭontact_id INT IDENTITY( 1, 1) PRIMARY KEY,Ĭode language: SQL (Structured Query Language) ( sql ) Let’s set up a sample table for the demonstration. Use DELETE statement to remove the duplicate rows.Find duplicate rows using GROUP BY clause or ROW_NUMBER() function.To delete the duplicate rows from the table in SQL Server, you follow these steps:
Find and delete duplicate rows in sql how to#
Summary: in this tutorial, you will learn how to delete duplicate rows from a table in SQL Server.
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