Change the Connection Associated with a Query
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
A query can be executed against several different servers or databases by changing the connection used by the query.
To change the connection associated with a query
In Query Editor, right-click a blank area of Query Editor, point to Connection, and then click Change Connection.
In the Connect to Database Engine dialog box, provide the new connection information, and then click Connect.
See Also
Solution Explorer
Associate a Query with a Connection in a Project
View or Change the Properties of a Connection in a Project