是否可以使用SQL和mySql中的数据库，通过内部连接从不同的数据库中获取信息?

I have my project A with mySql database and I have another project B with msSql. I have connected the database from A and fetched data from B. But now I need to use inner join for tables in A and B. Is it possible to do so with databases in the same server and different server? Any help will be appreciated.I have my project A with mySql database and I h