In this tutorial, you have learned how to delete duplicate rows from a table in SQL Server. SELECT contact_id,Įmail Code language: SQL (Structured Query Language) ( sql ) If you query data from the ntacts table again, you will find that all duplicate rows are deleted. SQL Server issued the following message indicating that the duplicate rows have been removed. Then, the DELETE statement deletes all the duplicate rows but keeps only one occurrence of each duplicate group.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 ( Not standard-just representation of interference at the duplicate-split by. Definitions of Duplicate If the answer you seek is not in the answers above these definitions may help solving your crossword puzzle. More synonyms can be found below the puzzle answers. Delete duplicate rows from a table example Some common synonyms of interfere are intercede, interpose, intervene. Synonyms for Duplicate are for example copy, double and imitate. 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: Summary: in this tutorial, you will learn how to delete duplicate rows from a table in SQL Server.
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