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例子
相同的字段(caiName)有好几条数据,表名是Answer
步骤
一、取出想同名字的id和caiName
sql语句:select caiName,id from Answer where caiName = "菠萝炒饭";
二、取出其中id最小的一条记录
sql语句:select id from Answer where caiName = "菠萝炒饭" group by caiName;
三、进行拼装删除
sql语句:delete from Answer where id in(**select a.id from(**select id from Answer a where a.caiName = "菠萝炒饭"**)a**) and id not in (select b.id from (select `id` from Answer b where b.caiName = "菠萝炒饭" group by caiName)b);
四、验证结果
sql语句:select caiName,id from Answer where caiName = "菠萝炒饭";
注意点
在第三步的** **部分是需要填写的不填写的话就会报错
You can't specify target table '表名' for update in FROM clause
所以要加上 加粗的部分
解决办法
借鉴别人的解决办法有解释