What is Data Definition Language? Source: DataSunrise Data Definition Language (DDL) uses a set of preset commands and a specific syntax to construct and modify objects' structures within databases. The tables, sequences, locations, aliases, schemas, and indexes that are part of this database are among them. Storage groups, various structures, and other objects in a database can be defined using commands in the standardized language DDL. Tables, indexes, and stogroups are examples of database objects that can be created, modified, or deleted using DDL commands. Any language that specifies data can also be referred to as DDL in a general sense. Databases, aliases, locations, indexes, tables, and sequences can all be created and deleted using DDL statements written in Structured Query Language (SQL). Statements to modify these objects and add or remove certain table restrictions are also included. Examples of these statements are as follows: UNIQUE PRIMARY FOREIGN KEY CHECK Common ...