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Query to remove duplicate rows from a table

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Beautiful Baboon answered on March 13, 2020 Popularity 10/10 Helpfulness 4/10

answer Query to remove duplicate rows from a table

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Query to remove duplicate rows from a table

Comment

DELETE FROM Customers WHERE ROWID(SELECT MAX (rowid) FROM Customers C WHERE CustomerNumber = C.CustomerNumber);

Popularity 10/10 Helpfulness 4/10 Language sql

Source: www.edureka.co

Tags: rows sql

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Contributed on Nov 19 2021

Beautiful Baboon

0 Answers Avg Quality 2/10

Closely Related Answers

how to query without duplicate rows in sql

Comment

-1

SELECT DISTINCT col1,col2... FROM table_name where Condition;

Popularity 10/10 Helpfulness 5/10 Language sql

Source: Grepper

Tags: sql

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Contributed on Oct 02 2020

VeNOM

0 Answers Avg Quality 2/10

tsql remove duplicate rows

Comment

DELETE T
FROM
(
SELECT *
, DupRank = ROW_NUMBER() OVER (
              PARTITION BY key_value
              ORDER BY (SELECT NULL)
            )
FROM original_table
) AS T
WHERE DupRank > 1

Popularity 8/10 Helpfulness 5/10 Language sql

Source: learn.microsoft.com

Tags: rows sql s

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Contributed on Nov 14 2022

WilsonWW

0 Answers Avg Quality 2/10

sql delete duplicate rows

Comments(1)

WITH cte AS (
    SELECT 
        contact_id, 
        first_name, 
        last_name, 
        email, 
        ROW_NUMBER() OVER (
            PARTITION BY 
                first_name, 
                last_name, 
                email
            ORDER BY 
                first_name, 
                last_name, 
                email
        ) row_num
     FROM 
        sales.contacts
)
DELETE FROM cte
WHERE row_num > 1;

Popularity 10/10 Helpfulness 4/10 Language sql

Source: www.sqlservertutorial.net

Tags: rows

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Contributed on Jun 17 2022

Dead Dotterel

0 Answers Avg Quality 2/10

how to delete one of the duplicates sql

Comment

SET ROWCOUNT 1
DELETE [dbo].[table] where ....
SET ROWCOUNT 0

Popularity 9/10 Helpfulness 3/10 Language sql

Source: Grepper

Tags: sql

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Contributed on Apr 12 2023

Ruben Visser

0 Answers Avg Quality 2/10

delete duplicate records from table rownum

Comment

DELETE FROM Customers WHERE ROWID NOT IN (SELECT MAX (rowid) FROM Customers C WHERE CustomerNumber = C.CustomerNumber);

Popularity 7/10 Helpfulness 3/10 Language whatever

Source: Grepper

Tags: records rownum whatever whateve

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Contributed on Mar 31 2023

Nervous Nightingale

0 Answers Avg Quality 2/10

sql delete duplicate rows but keep one

Comment

# Step 1: Copy distinct values to temporary table
CREATE TEMPORARY TABLE tmp_user (
    SELECT id, name 
    FROM user
    GROUP BY name
);

# Step 2: Remove all rows from original table
DELETE FROM user;

# Step 3: Remove all rows from original table
INSERT INTO user (SELECT * FROM tmp_user);

# Step 4: Remove temporary table
DROP TABLE tmp_user;

Popularity 10/10 Helpfulness 3/10 Language sql

Source: www.designcise.com

Tags: rows

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Contributed on Mar 13 2020

Upset Unicorn

0 Answers Avg Quality 2/10

delete duplicate records in sql

Comment

WITH cte AS (
    SELECT 
        contact_id, 
        first_name, 
        last_name, 
        email, 
        ROW_NUMBER() OVER (
            PARTITION BY 
                first_name, 
                last_name, 
                email
            ORDER BY 
                first_name, 
                last_name, 
                email
        ) row_num
     FROM 
        sales.contacts
)
DELETE FROM cte
WHERE row_num > 1;
Code language: SQL (Structured Query Language) (sql)

Popularity 9/10 Helpfulness 3/10 Language typescript

Source: www.sqlservertutorial.net

Tags: records

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Contributed on Apr 21 2023

Nanu

0 Answers Avg Quality 2/10

sql query to delete duplicate records

Comment

-2

--ID should be primary key

--get duplicate records using RANK
SELECT E.ID, 
    E.firstname, 
    E.lastname, 
    E.country, 
    T.rank
FROM [SampleDB].[dbo].[Employee] E
  INNER JOIN
(
 SELECT *, 
        RANK() OVER(PARTITION BY firstname, 
                                 lastname, 
                                 country
        ORDER BY id) rank
 FROM [SampleDB].[dbo].[Employee]
) T ON E.ID = t.ID;

--delete duplications
DELETE E
    FROM [SampleDB].[dbo].[Employee] E
         INNER JOIN
    (
        SELECT *, 
               RANK() OVER(PARTITION BY firstname, 
                                        lastname, 
                                        country
               ORDER BY id) rank
        FROM [SampleDB].[dbo].[Employee]
    ) T ON E.ID = t.ID
    WHERE rank > 1;

Popularity 10/10 Helpfulness 2/10 Language sql

Source: Grepper

Tags: records

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Contributed on Jan 23 2021

RakshaD

0 Answers Avg Quality 2/10

sql script to delete duplicate records in a table

Comment

-1

WITH CTE([FirstName], 
    [LastName], 
    [Country], 
    DuplicateCount)
AS (SELECT [FirstName], 
           [LastName], 
           [Country], 
           ROW_NUMBER() OVER(PARTITION BY [FirstName], 
                                          [LastName], 
                                          [Country]
           ORDER BY ID) AS DuplicateCount
    FROM [SampleDB].[dbo].[Employee])
DELETE FROM CTE
WHERE DuplicateCount > 1;
/*will delete the duplicate value*/

Popularity 9/10 Helpfulness 1/10 Language sql

Source: www.sqlshack.com

Tags: records

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Contributed on Jul 08 2022

Akshay Kumar Sinha

0 Answers Avg Quality 2/10

Query to remove duplicate rows from a table

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Query to remove duplicate rows from a table

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sql script to delete duplicate records in a table

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