What are data definition commands?

What are data definition commands in SQL?

Data Definition Language (DDL) - These SQL commands are used for creating, modifying, and dropping the structure of database objects. The commands are CREATE, ALTER, DROP, RENAME, and TRUNCATE.

What is Data Definition Language Give example?

Stands for "Data Definition Language." A DDL is a language used to define data structures and modify data. For example, DDL commands can be used to add, remove, or modify tables within in a database. DDLs used in database applications are considered a subset of SQL, the Structured Query Language.

What are all DDL commands?

SQL DDL CommandsCREATE – Create an object. ... DROP – This SQL DDL command helps to delete objects. ... ALTER – Used to alter the existing database or its object structures.TRUNCATE – This SQL DDL command removes records from tables.RENAME – Renaming the database objects.SQL DML, DDL, DCL, and TCL Commands - Tutorial Gateway

What is data definition in database?

What Does Data Mean? Data, in the context of databases, refers to all the single items that are stored in a database, either individually or as a set. Data in a database is primarily stored in database tables, which are organized into columns that dictate the data types stored therein.