Sql 如何删除重复数据

如何删除重复数据？数据格式如下

Id          name    firstname   time      age
13014495    abc     def         40:44.3   25
13022149    abc     def         40:44.3   25

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如果您正在使用Oracle，请尝试以下操作：

    Delete from Your_Table
    Where 
    ROWID not in (Select min(ROWID) 
           from Your_Table               
           group by name, firstname ,time ,age         
           );

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为了清楚起见，这将删除name和firstname列相等的最小id。您好，这是仅在两列组合上删除重复行，如果您想要更多行而不是在条件中添加更多行…并且一旦我们了解RDBMS，我们也可以作为重复问题结束。

    Delete from Your_Table
    Where 
    ROWID not in (Select min(ROWID) 
           from Your_Table               
           group by name, firstname ,time ,age         
           );

delete from table 
where rowid > (SELECT min(rowid) 
               FROM table t2 
               group by t2.id,t2.name,t2.firstname,t2.time,t2.age);