New to inner join

What does ".." follow by table name means? mydbname..mytablname1 a
What is the alternative?


select a.test, b.test2
from mydbname..mytablname1 a  
inner join mydbname2..mytable2 b
on a.test = b.test2
where a.test = 'myvalue'
VBdotnet2005Asked:
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talker2004Commented:
The only time i have ever seen "..." together like that in sql server is when you are using linked servers.

Normally the ... is not required, but if you are linking an access database to your sql server you will need the ... in order to query the table.

It is also possible to link other databases to your sql server.

http://msdn.microsoft.com/en-us/library/ms188279.aspx


Did you have any other questions or issues with the query?

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Anurag ThakurTechnical ManagerCommented:
DatabaseName..TableName syntax is normally used when you want to join 2 databases in a query (different kind of joins)
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Obadiah ChristopherCommented:
.. is used for the username as dbo... if u have a username for the db then u write like this
mydbname.user1.mytablname1
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jinn_hnnlCommented:
addition to those answers:

Normally if you want to join 2 table with foreign key constraints using inner join (which data has to exist in both parent and child table), and these 2 databases are in the same database. You dont have to specify the database name at the beginning. Just go:

(database: Organization)
Select U.*, C.CompanyName
From Companies C
INNER JOIN Users U
ON C.CompanyID = U.CompanyID

if this Users Table is in different database (Branches) then you have to specify:
Select U.*, C.CompanyName
From Companies C
 INNER JOIN Branches.dbo.Users U
 ON C.CompanyID = U.CompanyID
-- or : ON C.CompanyID = Branches.dbo.Users.CompanyID

when you run this query you are connecting to Orgranization database, that's why you only have to mention DB name for Users, but it safe to do both.

Hope this helps

JINN


 
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