What is the purpose of the INDEX statement in database definition language?

What is the purpose of database definition language (DDL)?

Which statement is used to modify an existing table in a database?

Which statement is used to create a new table in a database?

Which statement is used to define a view in a database?

Which statement is used to grant privileges to a user in a database?

Which statement is used to add or modify constraints on a table?

What is the purpose of the DROP statement in database definition language?

What is the purpose of the REVOKE statement in database definition language?