有张表student有字段 id,name,se
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参考答案:
1 select * from student 2 . update test1
group by id,name,sex,birth
having count(name)>1
set sex =case sex when '男' then '女' else '男' end from student
参考答案:
1 select * from student 2 . update test1
group by id,name,sex,birth
having count(name)>1
set sex =case sex when '男' then '女' else '男' end from student