Alter table old_table_name rename to new_table_name;
Alter table emp rename to employee_data;
Alter table table_name add columns(column_name datatype);
Alter table employee_data add columns (age int);
Alter table table_name change old_column_name new_column_name datatype;
Alter table employee_data change name first_name string;
alter table employee_data replace columns( id string, first_name string, age int);