Question

可能重复：
Removing duplicate rows from table in Oracle

以下是我目前所拥有的一个例子：

ID        Name1    Name2
ABC123    Bob      Jones
ABC123    Bob      Smith
ABC123    Bob      Hammond
DEF234    Tim      Whatever

我希望上面的表格看起来像这样：

ID        Name1    Name2
ABC123    Bob      Jones
DEF234    Tim      Whatever

我想删除共享ID字段的所有行，我不关心保留或删除哪些行，只是总行数等于唯一ID的数量。

Answer 1

DELETE FROM YOURTABLE Y WHERE ROWID > (SELECT min(rowid) FROM YOURTABLE X
WHERE X.ID = Y.ID)

Answer 2

如果您因任何原因没有全局唯一ID，那么这样的事情应该有效：

DELETE FROM Table WHERE CONCAT(ID,Name1,Name2) NOT IN ( 
       SELECT MIN(CONCAT(ID,Name1,Name2)) FROM Table GROUP BY ID)

Answer 3

 DELETE FROM your_table
      WHERE ROWID IN (
               SELECT rid
                  FROM (SELECT ROWID rid,
                           ROW_NUMBER () OVER (PARTITION BY ID ORDER BY ROWID) rn
                         FROM your_table)
                WHERE rn <> 1);

删除某些值出现多次SQL的行

3 个答案: