merge into汇总插入更新_insert_update到课堂评分表
为了实现定期job从课堂参与表汇总数据到课堂评分表，如在目标表没有数据，就插入，否则更新，查阅语法，采用如下方法
merge into O_CLASSAPPRAISEINFO a
using(select a.classid,count(b.appraise) commentnumber,count(distinct a.userid) engagednumber,ceil(sum(b.appraise)/count(distinct b.userid)) starlevel
from o_classpartyinfo a,o_classpartyinfo b
where a.logid=b.logid and a.classid=b.classid and b.appraise is not null
group by a.classid
) b
on (a.classid=b.classid)
when matched then update set a.appraisename=b.commentnumber,a.engagednumber=b.engagednumber,a.starlevel=b.starlevel,
when not matched then insert (a.appraiseid,a.classid,a.appraisename,a.engagednumber,a.starlevel,a.createtime)
values(lpad(SEQ_ONLINEMV.nextval,16,'0'),b.classid,b.commentnumber,b.engagednumber,b.starlevel,sysdate)
using(select a.classid,count(b.appraise) commentnumber,count(distinct a.userid) engagednumber,ceil(sum(b.appraise)/count(distinct b.userid)) starlevel
from o_classpartyinfo a,o_classpartyinfo b
where a.logid=b.logid and a.classid=b.classid and b.appraise is not null
group by a.classid
) b
on (a.classid=b.classid)
when matched then update set a.appraisename=b.commentnumber,a.engagednumber=b.engagednumber,a.starlevel=b.starlevel,
when not matched then insert (a.appraiseid,a.classid,a.appraisename,a.engagednumber,a.starlevel,a.createtime)
values(lpad(SEQ_ONLINEMV.nextval,16,'0'),b.classid,b.commentnumber,b.engagednumber,b.starlevel,sysdate)
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/9240380/viewspace-668213/ ，如需转载，请注明出处，否则将追究法律责任。
请登录后发表评论
登录
全部评论
最新文章
- redhat要持续学习哟加加油
- 升级redhat 6.8 默认gdb 7.2到gdb 8.3.1操作指南
- redhat 6.8升级默认cmake 2.8到cmake 3.9
- mysql source code源代安装的前提条件requirement
- mysql handler语句之一
- mysql show open tables相关知识体系之一
- mysql snapshot read快照读及current read当前读与锁lock之一
- mysql 5.7 _rowid虚列之一
- mysql innodb lock锁之record lock之一
- mysql隐式提交事务transaction一点笔记
