DQL、DML、DDL、DCL、TCL

• DQL: (Data QueryLanguage) data query language (manipulate data)

select ... from ... where

• DML: (Data Manipulation Language) data manipulation language (can control transaction submission and manipulate data)

insert、update、delete

• DDL: (Data Definition Language) database schema definition language (implicitly commit transactions, operate databases, tables)

create databse、create table、create view、creaate index、alter table、alter view、drop table、drop view、truncate table

• DCL: (Data Control Language) data control language (operating database users or role permissions)

grant、revoke、create user

• TCL (Transaction Control Language) transaction control language

rollback、commit、savepoint

 

(1) Explicitly submit
Use the commit command:
SQL>COMMIT;

(2) Implicit submission The
following commands are submitted automatically, and rollback is not supported:
ALTER, AUDIT, COMMENT, CONNECT, CREATE, DISCONNECT, DROP, EXIT, GRANT, NOAUDIT, QUIT, REVOKE, RENAME.

(3) Automatic submission
If AUTOCOMMIT is set to ON, the system will automatically submit after the insert, modify, and delete statements are executed.
SQL>SET AUTOCOMMIT ON;