1、DDL(Data Definition Language) Commandcreate,alter,drop objects;grant,revoke privileges and roles;establishing auditing options;add comments to the data dictionary;Before and after each DDL statement,Oracle implicitly commit the current transactions.2、DML(Data Manipulation Language) CommandQuery and Modify data within existing schema objects;DML statements consist of DELETE,INSERT,SELECT and UPDATE statements; EXPLAIN PLAN statements; LOCK TABL
