How can we attach a database file in SQL?

In SQL, you can use the following syntax to attach a database file:

CREATE DATABASE <数据库名>
    ON (FILENAME = '<文件路径>')
    FOR ATTACH;

Here, is the name of the database to be created, and is the full path of the database file to be attached.

For example, to attach a database file named “mydatabase” located at “C:\data\mydatabase.mdf”, you can use the following statement:

CREATE DATABASE mydatabase
    ON (FILENAME = 'C:\data\mydatabase.mdf')
    FOR ATTACH;

Please note that when attaching a database file, the file path should be the complete path of the database file, including the file name and extension.