如何联合来自两个不同数据库的不同表？

Question

I currently find myself stuck in a situation where I have to union different tables from two different databases. The other database served as an archive for records which are no longer accessed but still needed for reports. I am developing an interface where they could view historical reports. I am using MS SQL Server. Is it possible to do this?

Any help would be highly appreciated...

Answer 1

you need to use three part naming convention

ex:
database name:A
Schema name:dbo
table name test

You can refer like select top 10* from a.dbo.test

Similarly to union two different tables in two different databases,you can do like below

select top  10* from a.dbo.test
union
select top  10* from b.dbo.test

if those databases are in different server ( say server1 and server 2),you need to create linked server and you can access like below

select top  10* from server1.a.dbo.test
union
select top  10* from server2.a.dbo.test