How to join two data base

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How to join two data base in table sql

Posted 17-Apr-13 0:39am

DhananjayanP

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Prasad_Kulkarni · Answer 1 · 2013-04-17T00:51:00

Solution 1

Try this:

SQL

SELECT 
a.userID, 
b.usersFirstName, 
b.usersLastName  
FROM databaseA.dbo.TableA a 
JOIN database B.dbo.TableB b 
ON a.userID=b.userID

Found it here[^]

Posted 17-Apr-13 0:51am

Prasad_Kulkarni

Shanalal Kasim · Answer 2 · 2013-04-17T00:52:00

Solution 2

Try below sql

SQL

SELECT a.columnname,b.columnName  FROM databaseA.dbo.TableA a inner join database B.dbo.TableB b  ON a.ID=b.ID

Posted 17-Apr-13 0:52am

Shanalal Kasim

CHill60 · Answer 3 · 2013-04-17T00:53:00

If the databases are on the same instance (server) then all you need to do is fully qualify the table names. For example ...

SQL

FROM [DatabaseA].[TableOwnerA].TableA AliasA INNER JOIN [DatabaseB].[TableOwnerB].[TableB] AliasB ON ...

Strictly speaking you don't need the full qualification on the database to which you are connected but the way I've shown it means you can connect to either database and get the same result.

If the databases are on different SQL instances then you will need to set each server up as a "Linked Server" to the other. Microsoft documentation on setting up a linked server[^]