One SQL statement queries multiple databases and multiple SQL statements

Source: Internet
Author: User

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 DATABASEStatement 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

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