Which of the following is not a DDL command?CREATEDROPSELECTALTER

The command that is not a DDL (Data Definition Language) command from the given options is SELECT. The SELECT command is a part of DML (Data Manipulation Language), not DDL. DDL commands are used to define or alter the structure of the database, such as CREATE, DROP, ALTER. On the other hand, DML commands are used to manage data within the schema objects, like SELECT, INSERT, UPDATE, DELETE.