Very basics of MYSQL Commands

For converting from root to mysql server

mysql -u root -p
enter mysql pass

later to get into one db
use database_name;

later you can change db tabel name as
ALTER TABLE name_old RENAME name_new;

or drop a table like
DROP TABLE table1;
or
DROP TABLE IF EXISTS table1;

to drop multiple tables
DROP TABLE IF EXISTS table1, table2, table3;