Question

我需要删除此表的重复值：

+----+-------+-------------+---------+
| id | name  | description | surname |
+----+-------+-------------+---------+
| 1  | Peter | Member      | Hitsh   |
| 2  | James | Member      | Tach    |
| 3  | Mary  | Member      | Popims  |
| 4  | Peter | Member      | Hitsh   |
+----+-------+-------------+---------+

我希望使用相同的name和surname删除所有重复的值。

Answer 1

要为id上的每组重复项保留最小(name, surname)的行：

DELETE FROM tbl
USING (
   SELECT id, row_number OVER (PARTITION BY name, surname ORDER BY id) As rn
   FROM   tbl
   ) del
WHERE  tbl.id = del.id
AND    del.rn > 1;

假设id是唯一的。

今天非常相似的问题：
Delete all rows but one with the greatest value per group

删除两个字段上包含重复项的行

1 个答案: