Mysql去除重复值列，只保留一条_MySQL

Mysql去除重复值列，只保留一条

1DELETE2FROM3      software USING (software,(SELECT DISTINCT min(id) AS id, ident FROM software GROUP BY ident HAVING count(1) > 1) AS t2)4WHERE5      software.ident = t2.ident6AND software.id > t2.id;