Sql Query To Delete Duplicate Records

Sql Query To Delete Duplicate Records - How to delete duplicate rows in SQL Server Stack Overflow How to delete duplicate rows in SQL Server Ask Question Asked 10 years 3 months ago Modified 2 months ago Viewed 1 4m times 579 How can I delete duplicate rows where no unique row id exists My table is Step 1 First we have to create a table named DETAILS Query CREATE TABLE DETAILS SN INT IDENTITY 1 1 PRIMARY KEY EMPNAME VARCHAR 25 NOT NULL DEPT VARCHAR 20 NOT NULL CONTACTNO BIGINT NOT NULL CITY VARCHAR 15 NOT NULL Step 2 Now we have to insert values or data in the table Query Duplicates Share Improve this question Follow edited Aug 16 2022 at 15 54 TylerH 20 9k 68 77 102 asked Aug 20 2008 at 21 51 Seibar 69k 38 89 99 15 Quick tip for PostgreSQL users reading this lots going by how often it s linked to Pg doesn t expose CTE terms as updatable views so you can t DELETE FROM a CTE term directly

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Sql Query To Delete Duplicate Records

How To Delete The Duplicate Records In Oracle SQL YouTube

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SQL Query To Delete Duplicate Values Using CTE Method 3 Hindi YouTube

Sql query to delete duplicate values using cte method 3 hindi youtube

Do you need to use SQL to remove duplicates in your tables Learn how to write an SQL query to remove duplicate data in this article Table of Contents The Problem Removing Duplicates in SQL Summary of Methods Method 1 ROW NUMBER Analytic Function Method 2 Delete with JOIN Method 3 MIN or MAX Function Method 4 DENSE RANK

Method 1 Run the following script SQL SELECT DISTINCT INTO duplicate table FROM original table GROUP BY key value HAVING COUNT key value 1 DELETE original table WHERE key value IN SELECT key value FROM duplicate table INSERT original table SELECT FROM duplicate table DROP TABLE duplicate table

SQL Query To Delete Duplicate Records Just Tech Review

Sql query to delete duplicate records just tech review

How To Delete Duplicate Records From A Table In SQL How To Delete

How to delete duplicate records from a table in sql how to delete

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It s easy to find duplicates with one field SELECT email COUNT email FROM users GROUP BY email HAVING COUNT email 1 So if we have a table ID NAME EMAIL 1 John asd asd 2 Sam asd asd 3 Tom asd asd 4 Bob bob asd 5 Tom asd asd This query will give us John Sam Tom Tom because they all have the same email

To delete the duplicate rows from the table in SQL Server you follow these steps Find duplicate rows using GROUP BY clause or ROW NUMBER function Use DELETE statement to remove the duplicate rows Let s set up a sample table for the demonstration Setting up a sample table First create a new table named sales contacts as follows