How to delete duplicates in SQL table based on multiple fields

Question

I have a table of games, which is described as follows:

+---------------+-------------+------+-----+---------+----------------+
| Field         | Type                


        

Answer 1

DELETE FROM table
WHERE id = 
    (SELECT t.id
    FROM table as t
    JOIN (table as tj ON (t.date = tj.data
                          AND t.hometeam_id = tj.hometeam_id
                          AND t.awayteam_id = tj.awayteam_id
                          ...))

Answer 2

delete from games 
   where id not in 
   (select max(id)  from games 
    group by date, time, hometeam_id, awayteam_id, locationcity, locationstate 
    );

Workaround

select max(id)  id from games 
    group by date, time, hometeam_id, awayteam_id, locationcity, locationstate
into table temp_table;

delete from games where id in (select id from temp);

Answer 3

The best thing that worked for me was to recreate the table.

CREATE TABLE newtable SELECT * FROM oldtable GROUP BY field1,field2;

You can then rename.