Question

在我的表中有很多重复的行。我有一个SELECT，提供我想要删除的数据，但我该怎么做？无论我尝试什么，我都会收到错误。

SELECT *
  FROM tablename t
 WHERE NOT EXISTS (         
              SELECT 1
                FROM tablename t2
               WHERE t2.column = t.column
              HAVING COUNT(*) = 1
                     )

Answer 1

只需将'SELECT *'更改为'DELETE'

即可

DELETE 
FROM tablename t
WHERE NOT EXISTS (         
              SELECT 1
              FROM tablename t2
              WHERE t2.column = t.column
              HAVING COUNT(*) = 1
              )

将SELECT语句更改为DELETE

1 个答案: