Question

我必须在桌面上更新700行。只用一个查询就可以做到吗？

2个例子：

UPDATE PERSON p SET p.admin = (select usr.iqid from USER usr where usr.userid = 'J072') where upper(person.myid) = '18349';

UPDATE PERSON p SET p.admin = (select usr.iqid from USER usr where usr.userid = 'PU96') where upper(person.myid) = '36895';

Answer 1

我会把它写成：

UPDATE PERSON p
    SET p.admin = (SELECT u.iqid 
                   FROM USER u
                   WHERE (u.userid = 'J072' AND p.myid = '18349') OR
                         (u.userid = 'PU96' AND p.myid = '36895')
                  )
    WHERE p.myid IN ('18349', '36895');

请注意，数字不需要upper()。它通常会妨碍索引的使用。

Answer 2

选项1。

update person p
   set p.admin      =
          (select usr.iqid
             from user usr
            where usr.userid = decode(upper(person.myid),  '36895', 'PU96',  '18349', 'J072'))
 where upper(person.myid) = any ('36895', '18349');

选项2。使用merge语句来避免相关的标量子查询。

选项3。 Update (select ... from person join user) set ...如果有人拥有外键引用用户。谷歌＆＃34;密钥保存视图＆＃34;。

使用另一个表

2 个答案: