computer-advance数据库what_are_the_difference_between_ddl_dml_and_dcl_commands本页总览what_are_the_difference_between_ddl_dml_and_dcl_commands数据库一直在用，但一直没有系统学习过，只 会建建表，做些增删改查。 reference what-is-ddl-and-dml what_are_the_difference_between_ddl_dml_and_dcl_commands