mysql不允许子查询的同时删除原表数据
错误:
delete from titles_test
where id not in(
select min(id) from titles_test group by emp_no
)
正确:给子查询表添加别名
delete from titles_test
where id not in(
select * from (
select min(id) from titles_test group by emp_no
)a
)
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