mysql通過對比一張表的數據來修改另一張表兩種sql的對比

https://blog.csdn.net/weixin_39180123/article/details/78720222

將表b 中的字段值 賦值給表a 字段值

UPDATE powershu_aiops_biz_dev.aiops_cmdb_host a,
bjetc_aiops_biz_deploy.aiops_cmdb_host b 
SET a.type=b.type ,a.zone = b.zone ,
a.biz_category = b.biz_category ,
a.tags = b.tags , 
a.os_type = b.os_type 
WHERE a.alias_name = b.alias_name