Oracle SQL:使用另一个表中的数据更新表 [英] Oracle SQL: Update a table with data from another table

问题描述

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更新查询，该查询可以使用相同的id用表2的name和desc更新表1?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

问题取自用另一个表中的数据更新一个表，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 )

假设联接导致键保留视图，您也可以

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

这篇关于Oracle SQL:使用另一个表中的数据更新表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！