Can you join across two databases?

Question

SQL Server allows you to join tables from different databases as long as those databases are on the same server. The join syntax is the same; the only difference is that you must fully specify table names. Let's suppose you have two databases on the same server - Db1 and Db2 . 11 июл. 2012 г.

How do I link two databases together?

The Get External Data - Access Database import and link wizard opens. In the File name text box, type the name of the source database or click Browse to display the File Open dialog box. Click Link to the data source by creating a linked table, and then click OK. The Link Tables dialog box opens.

Can I query from two different databases?

For querying multiple tables in different databases on the same server, all we have to do is use the fully qualified table name. The only condition is, the user logged into the query analyzer (or used for executing the query) should have permission on both the databases.

Can we join tables from two different databases on different servers?

Approach #1: Use synonyms to link tables between databases on the same server. Approach #2: Collect data separately from each database and join it in your code. Your database connection strings could be part of your App-server configuration through either a database or a config file.

Can we join two tables different databases in mysql?

Yes, assuming the account has appropriate permissions you can use: SELECT <...> FROM A. table1 t1 JOIN B.

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