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 vote309 views1 answer
Alter user mysql native password
SQL
0 vote305 views1 answer
Calculate discount from original price sql
SQL
2 votes330 views3 answers
Application.properties spring boot mysql
SQL
32 votes443 views6 answers
Rename column mysql
SQL
0 vote362 views2 answers
Timing sql queries
SQL
0 vote386 views1 answer
Plsql check how much space all databases are consuming
SQL
57 votes555 views6 answers
Sql alter table
SQL
0 vote350 views1 answer
Sql server alter table add column datetime default current_timestamp
SQL
1 vote354 views1 answer
Get parameter value in mysql trigger
SQL
2 votes338 views5 answers
Alter table primary key postgresql
SQL