Delete data, and keep one, rowid pseudo column is reserved for a minimum of data, if there are other needs, can be slightly altered, can retain their own order data.
delete from table_name a
where a.name in
(select name from table_name group by name having count(*) > 1)
and rowid not in
(select min(rowid) from table_name group by name having count(*) > 1)
Note: When using the need to replace their table and column names
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Author: xy Tang and Song
Source: CSDN
Original: https: // blog .csdn.net / weixin_42054155 / article / details / 89337786
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