新建Database Links过程如下：
1、在plsql左侧栏中找到Database links 右键 new ，Database links的创建截图如下：
oracle复制列值
标签：oracle 复制列值 不同数据库
oracle复制列值
ext_organinfo eop
SET eop.thumbnailmap = (SELECT eo.thumbnailmap
FROM ext_organinfo@puam eo
WHERE eo.organ_id = eop.organ_id)
WHERE eop.organ_id IN (SELECT eo.organ_id
FROM ext_organinfo@puam eo
WHERE eo.thumbnailmap IS NOT NULL )