One SQL statement queries multiple databases and multiple SQL statements
Requirement: An SQL statement is used to query the associated results from multiple databases and output them to the client.
Investigation: The spring framework can configure multiple data sources. SQL can also attach multiple databases to a primary database.
Solution: UseATTACH DATABASE
Statement to add multiple databases to the master database.
Syntax:
Attach database 'databasename 'As 'Alias-name ';
Example:
Attach database 'C: \ Users \ Administrator \ Desktop \ sqlite_data.sq3 'As 'sd ';
Summary
The preceding section describes an SQL statement used to query multiple databases. I hope it will be helpful to you. If you have any questions, please leave a message and I will reply to you in a timely manner. Thank you very much for your support for the help House website!