SQL Backup DB
A backup is useful only if you can restore the right data within the time your application can tolerate. Copying a few query results is not the same as backing up a database's structure, data, and required operational state.
Understand the idea
For a local MySQL or MariaDB lab, a logical dump is a practical starting point. Run the shown command in a terminal, not in the SQL editor. The password prompt avoids putting a password directly in the command text. Consistency options depend on table engines and concurrent schema changes; coordinate real production backups with the server's documented procedure.
Where to try it
Use Terminal: MySQL / MariaDB for this example. It is shown for reading and local practice; the SQLite browser editor does not run this dialect or supply application-driver parameters. Follow the setup and explanation below in a disposable local environment.
SQLite sample data · MySQL / MariaDB sample data · See the sample tables
A worked example
mysqldump -u root -p --single-transaction bhylu_sql_lab > bhylu_sql_lab.sql
Read the result
The terminal writes a SQL dump file if the tool, account, and database are available. Restore into a separate lab database and compare table counts before considering the backup tested. MariaDB installations may provide mariadb-dump instead.
Try one change
Restore the lab dump under a different database name. Check row counts and one joined report without overwriting the original database.