The meaning and difference between DML and DDL-be sure to understand
Meaning of DML and DDL:
1, DML (Data Manipulation Language) data manipulation language-the basic operation of the database, SQL data processing operations are collectively referred to as data manipulation language, in short, is to achieve the basic "add, delete and change" operation. Keywords included are: select, update, delete, insert, merge
DDL (Data Definition Language)-A language used to define and manage all objects in an SQL database, managing certain objects in the database (e.g., database,table). Keywords included are:
create、alter、drop、truncate、comment、grant、revoke
Difference between DML and DDL:
1. DML operations are transactions that can be manually controlled to open, commit, and rollback.
2. DDL operations are implicitly committed and cannot be rolled back!
