create database da01; ERROR 1007 (HY000): Can't create database 'da01'; database exists

This error message indicates that a database with the name 'da01' already exists in the system. To avoid this error, you may want to choose a different name for the database or check if the database already exists before trying to create it again. To check if the database exists, you can use the following command:

SHOW DATABASES;

This will display a list of all existing databases in the system. If the database you want to create already exists, you can either use it or drop it before creating a new one. To drop a database, you can use the following command:

DROP DATABASE da01;

This will remove the database from the system, allowing you to create a new one with the same name. Note that dropping a database will permanently delete all its data, so make sure you have a backup before doing this.