Oracle更新表中的重复行

本文关键字:更新 Oracle | 更新日期: 2023-09-27 18:23:42

我有一个名为users的Oracle表,其列为

name, location, organization, valid_from, valid_to, active.

我想做的是:如果有两条记录具有相同的名称、位置、组织,但valid_to、valid_from间隔重叠,则将每条记录的活动状态设置为"NOK"。以下是我尝试的方法:

UPDATE table SET active= 'NOK' 
WHERE 
(name, location, organization) IN (
     SELECT t1.name, t1.location, t1.organization   
     FROM table t1
     WHERE (valid_from > t1.valid_from and valid_to < t1.valid_to )
      GROUP BY t1.name, t1.location, t1.organization   
      HAVING COUNT(*) > 1) ;

但这似乎并没有达到我的愿望。我做错了什么?

Oracle更新表中的重复行

子查询中的WHERE子句对于所有行都将为FALSE,因为您没有为某些列指定表别名:

(valid_from > t1.valid_from and valid_to < t1.valid_to )

将被假定为

(t1.valid_from > t1.valid_from and t1.valid_to < t1.valid_to )

我认为这是你想要的:

UPDATE table t1 SET active = 'NOK' 
WHERE EXISTS 
( SELECT 1
  FROM   table t2
  WHERE  t2.name = t1.name
  AND    t2.location = t1.location
  AND    t2.organization = t1.organization
  AND    t1.valid_from <= t2.valid_to
  AND    t2.valid_from <= t1.valid_to
  AND    t1.ROWID != t2.ROWID
);

但是,如果valid_from或valid_to可以为null,那么您也需要处理这种情况。

(ROWID比较是为了防止拖带与自身匹配!)

试试这个方法:

UPDATE table SET a.active= 'NOK' 
from table a
inner join (
     SELECT t1.name, t1.location, t1.organization   
     FROM table t1
     WHERE (valid_from > t1.valid_from and valid_to < t1.valid_to )
      GROUP BY t1.name, t1.location, t1.organization   
      HAVING COUNT(*) > 1) b
  on a.name = b.name and a.location = b.location and a.organization = b.organization;