How to update data in one table from corresponding data in another table in SQL Server 2005

Question

I have two tables in different databases on the same database server.

Both the databases have the same structure, but different data. Database1 (Test1) is the latest

Answer 1

update test1 t1, test2 t2
set t2.deptid = t1.deptid
where t2.employeeid = t1.employeeid

you can not use from keyword for the mysql