Can join queries in Oracle 8i and above span multiple databases

Question

Hi,
In Oracle 8i and above, can join queries span multiple databases??
For eg., I have two databases A and B, and say database A has table A_T and
database B has table B_T. Assume that both the databases are on the same
server.
Can I run a join query from my application using OCI calls that spans across
tables from multiple databases, namely, A_T and B_T?
My query probably looks like this - Select * from A.A_T, B.B_T;
Thank you,
Sashi

Answer 1

In Oracle 8i and above, can join queries span multiple databases??
For eg., I have two databases A and B, and say database A has table A_T and
database B has table B_T. Assume that both the databases are on the same
server.
Can I run a join query from my application using OCI calls that spans across
tables from multiple databases, namely, A_T and B_T?
My query probably looks like this - Select * from A.A_T, B.B_T;If you create a database link from database A to B your SQL would look something like this:
select * from A.A_T, B.B_T@dbB where A.A_T.PK = B.B_T.PK@dbB
The Oracle manuals should have the information you need on creating a database link.