Oracle 联合表更新某一个表的字段

 背景：要把ORGAN.orgName字段 赋值到SYNRECORD.BUSINESSNAME字段，如下：

 首先,我们要找到关联的表，想办法把他们串联起来。最后要判断这个条件存在才进行更新。

update SYNRECORD d set d.BUSINESSNAME =(select c.orgName from RECORD a, ORGAN c where c.Userid = a.Applyuserid and a.dealnumber = d.businessid)
where exists (select 1 from GPRECORD a, SOORGAN c where c.Userid = a.Applyuserid and a.dealnumber = d.businessid) and d.BUSINESSNAME like '%？%'

   其中 RECORD.dealNumber = synrecord.businessid,  ORGAN.userid= RECORD.APPLYUSERID

 

判断某字段是否为null，判断是否为字符和数字时的写法不一样。当为数字时,

CASE WHEN columnName is null THEN 0 ELSE columnName END