mysql remove duplicates

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1DELETE t1 FROM subscriptions t1
2INNER JOIN subscriptions t2 
3WHERE 
4    t1.id < t2.id AND 
5    t1.user_id = t2.user_id AND t1.name = t2.name

1DELETE FROM table_name WHERE id 
2       NOT IN ( SELECT id FROM table_name 
3                   GROUP BY field_1, field_2)

1DELETE c1 FROM contacts c1
2INNER JOIN contacts c2 
3WHERE
4    c1.id > c2.id AND 
5    c1.email = c2.email;

1DELETE FROM CONTACTS
2WHERE ID NOT IN
3      (SELECT *
4       FROM (SELECT max(ID)		
5             FROM CONTACTS
6             GROUP BY EMAIL) t);
7 -- ⇓ Test it ⇓ (Fiddle source link)

1SELECT 
2    col1, COUNT(col1),
3    col2, COUNT(col2)
4FROM
5    table_name
6GROUP BY 
7    col1, 
8    col2
9HAVING 
10       (COUNT(col1) > 1) AND 
11       (COUNT(col2) > 1);
12

1DELETE t1 FROM contacts t1
2INNER JOIN contacts t2 
3WHERE 
4    t1.id < t2.id AND 
5    t1.email = t2.email;Code language: SQL (Structured Query Language) (sql)

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