Four categories of database languages

Source: Internet
Author: User

SQL languages fall into four categories:

  1. Dql (Data Query Language): Data Query Language
  2. DML (data manipulation language): data manipulation language
  3. DDL (Data Definition Language): Data Definition Language
  4. DCL (Data Control Language): Data Control Language

The data query language, that is, the SELECT statement.


The data control language, that is, the insert statement, update statement, and delete statement.


Data definition language, that is, the language used to create various objects (tables, views, indexes, synonyms, and clusters) in the database.

Create Table/View/index/SYN/Cluster


A Data Control language is a language used to grant or revoke certain privileges to access the database, control the time and Effect of database operations, and monitor the database.

1) Grant: Authorization

2) Commit/rollback

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