I need a query that retrieves info from an Oracle table and
a query that retrieves info from a SQL Server table. The
info has to be joined together according to Record ID
numbers. I have very limited access to the Oracle database
but full control of the SQL Server database.How do I join
two different queries from two different databases?
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Answer Posted / guest
To query to different data sources, you can make the Oracle
server a linked server to the SQL Server server. A linked
server can be any OLE DB data source and SQL Server
currently supports the OLE DB data provider for Oracle. You
can add a linked server by calling sp_AddLinkedServer and
query information about linked servers with sp_LinkedServers.
An easier way to add a linked server is to use Enterprise
Manager. Add the server through the Linked Servers icon in
the Security node. Once a server is linked, you can query it
using a distributed query (you have to specify the full name).
Here's an example of a distributed query (from the SQL
Server Books Online) that queries the Employees table in SQL
Server and the Orders table from Oracle:
SELECT emp.EmloyeeID, ord.OrderID, ord.Discount
FROM SQLServer1.Northwind.dbo.Employees AS emp,
OracleSvr.Catalog1.SchemaX.Orders AS ord
WHERE ord.EmployeeID = emp.EmployeeID
AND ord.Discount > 0
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