Mysql delete older 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 older 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

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 remove duplicates

DELETE t1 FROM contacts t1
INNER JOIN contacts t2 
WHERE 
    t1.id < t2.id AND 
    t1.email = t2.email;Code language: SQL (Structured Query Language) (sql)

-1

Source: mysqltutorial.org

Similar codes

0 vote213 views1 answer
Pgadmin postgres ERROR: database is being accessed by other users
SQL
3 votes163 views1 answer
Oracle list dates without weekends
SQL
0 vote170 views1 answer
Apache Derby: Create SQL Dump with data
SQL
1 vote219 views1 answer
Add time to date sql
SQL
2 votes184 views2 answers
Microsoft sql server extract hour and minute from datetime
SQL
0 vote173 views1 answer
How to select a row in sql
SQL
3 votes163 views1 answer
Sql server version query
SQL
0 vote219 views1 answer
Oracle temporary table
SQL
0 vote174 views1 answer
Create column that already exists mysql
SQL
18 votes200 views6 answers
Laravel form validation
SQL