Backup, Empty and Import databases with Drush in Drupal
Create a backup.
drush sql-dump > /path/to/folder/backup.sqlEmpty the database tables
drush sql-dropImport the tables
drush sql-cli < /path/to/folder/backup.sqldrush sql-dump > /path/to/folder/backup.sqldrush sql-dropdrush sql-cli < /path/to/folder/backup.sql