SQL

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 remove duplicates

DELETE t1 FROM subscriptions t1
INNER JOIN subscriptions t2 
WHERE 
    t1.id < t2.id AND 
    t1.user_id = t2.user_id AND t1.name = t2.name

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;

how to delete duplicate entries in a column in mysql

# Please write a DELETE statement and DO NOT write a SELECT statement.
# Write your MySQL query statement below
DELETE c1 FROM Person c1
INNER JOIN Person c2 
WHERE
    c1.id > c2.id AND 
    c1.email = c2.email;

#delete duplicate emails from table Person

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)

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)

Remove duplicate old value in mysql

DELETE `yellow_page_content`
   from `yellow_page_content`
  inner join (
     select max(`id`) as lastId, `code`
       from `yellow_page_content`
      group by `code`
     having count(*) > 1) duplic on duplic.code = yellow_page_content.code
  where yellow_page_content.id < duplic.lastId;

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)

remove duplicates mysql

DELETE c1 FROM addresslist c1
INNER JOIN addresslist c2 
WHERE
    c1.id > c2.id AND 
    c1.`city` = c2.`city` AND
    c1.`province` = c2.`province` AND
    c1.`pgiRegion` = c2.`pgiRegion`

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)