Sql 删除两个字段上重复的行
我需要删除此表的重复值:Sql 删除两个字段上重复的行,sql,database,postgresql,sql-delete,duplicate-data,Sql,Database,Postgresql,Sql Delete,Duplicate Data,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
+----+-------+-------------+---------+
| id | name | description | surname |
+----+-------+-------------+---------+
| 1 | Peter | Member | Hitsh |
| 2 | James | Member | Tach |
| 3 | Mary | Member | Popims |
| 4 | Peter | Member | Hitsh |
+----+-------+-------------+---------+
我希望删除所有具有相同
名称
和姓氏
的重复值,以便为(名称,姓氏)
上的每组重复项保留具有最小id的行
:
假设id
是唯一的
今天的问题非常相似:那么您的意思是每套副本保留一行?哪一个?
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;