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Database Languages


September 17, 2016
Published By : Pratik Kataria
Categorised in:


A database system provides a data definition language to specify the database schema and a data manipulation language to express database queries and updates.

DDL (Data Definition Language)

We specify a database schema by a set of definitions expressed by a special language called a DDL.

  • Create
  • Alter
  • Drop
  • Truncate
  • Comment

Example: create table account (acc_no char(10), balance integer);

DML (Data Manipulation Language)

DML is retrieval, insertion, and deletion of information from database.

  • Insert
  • Update
  • Delete
  • Query

Example: select acc_no, balance from account where acc_no = ‘A101’;