Oracle SQL:用另一个表中的数据更新一个表

2021-12-01 00:00:00 sql-update sql oracle

表 1:

id    name    desc
-----------------------
1     a       abc
2     b       def
3     c       adf

表 2:

id    name    desc
-----------------------
1     x       123
2     y       345

在 oracle SQL 中，如何运行 sql update 查询，该查询可以使用相同的表 2 的 name 和 desc 更新表 1id?所以我得到的最终结果是

In oracle SQL, how do I run an sql update query that can update Table 1 with Table 2's name and desc using the same id? So the end result I would get is

表 1:

id    name    desc
-----------------------
1     x       123
2     y       345
3     c       adf

问题来自用另一个表更新一个表，但专门用于 oracle SQL.

Question is taken from update one table with data from another, but specifically for oracle SQL.

推荐答案

这称为相关更新

UPDATE table1 t1
   SET (name, desc) = (SELECT t2.name, t2.desc
                         FROM table2 t2
                        WHERE t1.id = t2.id)
 WHERE EXISTS (
    SELECT 1
      FROM table2 t2
     WHERE t1.id = t2.id )

假设联接结果为保留键的视图，您还可以

Assuming the join results in a key-preserved view, you could also

UPDATE (SELECT t1.id, 
               t1.name name1,
               t1.desc desc1,
               t2.name name2,
               t2.desc desc2
          FROM table1 t1,
               table2 t2
         WHERE t1.id = t2.id)
   SET name1 = name2,
       desc1 = desc2

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