Mysql delete duplicates

Mysql remove duplicates

DELETE c1 FROM tablename c1
INNER JOIN tablename c2 
WHERE
    c1.id > c2.id AND 
    c1.unique_field = c2.unique_field;

Mysql delete duplicates

DELETE FROM CONTACTS
WHERE ID NOT IN
      (SELECT *
       FROM (SELECT max(ID)		
             FROM CONTACTS
             GROUP BY EMAIL) t);
 -- ⇓ Test it ⇓ (Fiddle source link)

Source: sqlfiddle.com

How to delete all duplicate items in mysql

DELETE FROM FriendsData WHERE fID 
       NOT IN ( SELECT fID FROM FriendsData 
                   GROUP BY UserID, FriendsUserID, IsSpecial, CreatedBy)

Mysql delete duplicate rows but keep one

DELETE c1 FROM contacts c1
INNER JOIN contacts c2 
WHERE
    c1.id > c2.id AND 
    c1.email = c2.email;

Source: mysqltutorial.org

Mysql delete older duplicates

 delete test
   from test
  inner join (
     select max(id) as lastId, email
       from test
      group by email
     having count(*) > 1) duplic on duplic.email = test.email
  where test.id < duplic.lastId;

Source: stackoverflow.com

Mysql delete duplicate rows except one

DELETE FROM NAMES
 WHERE id NOT IN (SELECT * 
                    FROM (SELECT MIN(n.id)
                            FROM NAMES n
                        GROUP BY n.name) x)

-1

Similar codes

-1 vote136 views1 answer
How to change the auto increment in existing table mysql
SQL
0 vote114 views1 answer
Lister les index d'une table oracle
SQL
2 votes92 views5 answers
Alter table primary key postgresql
SQL
3 votes157 views2 answers
Wp do sql query from function
SQL
0 vote134 views1 answer
Insert overwrite table in mysql in nifi
SQL
0 vote117 views1 answer
Mysql table variables
SQL
6 votes139 views1 answer
SQL insert all columns
SQL
1 vote133 views1 answer
Clear screen command in psql
SQL
0 vote143 views1 answer
No suitable driver found for sqlite
SQL
5 votes123 views2 answers
Sql number columns
SQL