oracle如何合并两行

Question

我有一个 table，它有多个记录。一条记录有几条数据，另一条有几条数据和更新的数据

ID	Name	gender	birthday	address	salary
1	Jhon	null	null	newyork	null
2	Jhon Deo	Male	1980	null	5000

我在另一个 table 中使用了 id 1 作为外键，所以我需要它。但是id 2有更多的更新数据。

我想将两条记录合并为 id 1 并删除 2

ID	Name	gender	birthday	address	salary
1	Jhon Deo	Male	1980	newyork	5000

Answer 1

如果要优先使用最新的id：

select distinct
       last_value(name ignore nulls) over (order by id desc) as name,
       last_value(gender ignore nulls) over (order by id desc) as gender,
       last_value(birthday ignore nulls) over (order by id desc) as birthday,
       last_value(address ignore nulls) over (order by id desc) as address,
       last_value(salary ignore nulls) over (order by id desc) as salary
from t;

Answer 2

您应该能够使用这些语句清除多余的记录 (ID 2)。请务必将以下语句中的 your_table 替换为您的实际 table 名称。

UPDATE your_table t1
   SET (name,
        gender,
        birthday,
        address,
        salary) =
           (SELECT nvl(t2.name, t1.name),
                   nvl(t2.gender, t1.gender),
                   nvl(t2.birthday, t1.birthday),
                   nvl(t2.address, t1.address),
                   nvl(t2.salary, t1.salary)
              FROM your_table t2
             WHERE t2.id = 2)
 WHERE t1.id = 1;

DELETE FROM your_table
      WHERE id = 2;

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