Using db_chaining in sql2005

I wanted to use db_chaining with our sql205 instance, if I have 5 databases ( same table ) name which I'm going to set ON for db_chaining. Then If I want to query data for all these 5 databases in single query ? how should my scripts works ?
actually what is db_chaining use for ?
motioneyeAsked:
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FemSteenkampConnect With a Mentor Commented:
DB chaining has just got to do with the permissions needed to access underlying tables.

you will still have to use something like linked servers or openrowset function with some joins to get a single result.

can you elaborate a bit more about what you want to achieve?
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reb73Connect With a Mentor Commented:
You don't have to enable db_chaining to query from 5 databases on the same server. Provided a login has access to the databases and is mapped to a database user, you can use the three part object reference (<dbname>.<schema>.<object>) to access objects across  multiple databases.

With db_chaining enabled, a login does not have to be necessarily mapped to a database user, but still needs to be given explicit access to the target databases and the 'guest' database user is used to map into the objects required..

Review the link below, which gives you an idea of how it works and possible security issues using db_chaining -

http://www.mssqltips.com/tip.asp?tip=1782
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Aaron ShiloConnect With a Mentor Chief Database ArchitectCommented:
hi
for retriving data from all tables you will need to query them normally by referencing the SERVER.DB.SCHEMA.TABLE.

DB_CHANING
from msdn : "Use the Cross DB Ownership Chaining option to configure cross-database ownership chaining for the instance of SQL Server. This security enhancement was added in SQL Server 2000 SP3 to allow you to manage cross-database security.

This server option allows you to control cross-database ownership chaining at the database level or to allow cross-database ownership chaining for all databases:
"
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