sql - 从另一个表中的查询更新一个表

Question

UPDATE devicenumplanmap 
SET devicenumplanmap.e164mask = '+1' 
FROM devicenumplanmap 
WHERE (select devicenumplanmap.pkid, devicenumplanmap.e164mask 
       from devicenumplanmap, device 
       where devicenumplanmap.fkdevice = device.pkid 
         and device.name like '%RDP' 
         and devicenumplanmap.e164mask like '819%')

出现语法错误。

我们想通过在另一个表中的搜索来更新表 devicenumplanmap。

Answer 1

看起来您正在尝试UPDATE使用JOIN. 根据您的 RDBMS，语法略有不同。

MySQL：

UPDATE devicenumplanmap d
    JOIN device de ON d.fkdevice = de.pkid
SET d.e164mask = '+1' 
WHERE de.name like '%RDP' 
       AND d.e164mask like '819%'

SQL 服务器：

UPDATE  d
SET d.e164mask = '+1' 
FROM devicenumplanmap d 
    JOIN device de ON d.fkdevice = de.pkid
WHERE de.name like '%RDP' 
       AND d.e164mask like '819%'

更通用的方法：

UPDATE devicenumplanmap 
SET e164mask = '+1' 
WHERE e164mask like '819%' AND
    fkdevice IN (
        SELECT pkid
        FROM Device 
        WHERE name like '%RDP' 
)

Answer 2

尝试这样的事情：

UPDATE devicenumplanmap 
SET devicenumplanmap.e164mask = '+1' 
FROM devicenumplanmap 
WHERE **exists(select ***
       from devicenumplanmap, device 
       where devicenumplanmap.fkdevice = device.pkid 
         and device.name like '%RDP' 
         and devicenumplanmap.e164mask like '819%')

Answer 3

这应该适用，简单易行

UPDATE devicenumplanmap
SET devicenumplanmap.e164mask = '+1' 
FROM devicenumplanmap dp 
INNER JOIN device d
ON dp.fkdevice = d.pkid
WHERE d.name like '%RDP' 
and dp.e164mask like '819%'