ORACLE 语句类型

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语句类型：
1.DDL （Data Definition Language ）数据库定义语言 statements are used to define the database structure or schema.
DDL不需要commit.
CREATE/ALTER/DROP/TRUNCATE/COMMENT/RENAME

2.DML （Data Manipulation Language）数据操纵语言 statements are used for managing data within schema objects.
需要commit.
INSERT/UPDATE/DELETE/MERGE/CALL/EXPLAIN PLAN/LOCK TABLE
3.DCL（Data Control Language）数据库控制语言  授权，角色控制等
GRANT/REVOKE
4.TCL（Transaction Control Language）事务控制语言
SAVEPOINT 设置保存点/ROLLBACK  回滚/SET TRANSACTION

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