ddl and dml in sql (the difference between database table and view)

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DDL and DMLDefinition and difference

1. DML (Data Manipulation Language) data manipulation language:

Scope of application: perform some simple operations on the data in the database, such as insert, delete, update, select, etc.

Data operations in tables (indexes and sequences) are DML operations, and data operations in databases (tables, indexes, sequences, synonyms, etc.) are DDL operations

2. DDL (Data Definition Language) data definition language:

Scope of application: To manage some objects in the database (for example, database, table), the objects of DDL are these three keywords

Create, Alter and Drop.

Difference:

1.DML operations can manually control the opening, committing and rolling back of transactions.

2. DDL operations are implicitly submitted and cannot be rolledback!

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