Data Definition Language include the following commands:Select one:a.ALTERb.SELECTc.UPDATEd.None of the answers are correcte.INSERT

To answer the question regarding Data Definition Language (DDL) commands, we need to understand what DDL includes.

1. Understanding DDL:

   • Data Definition Language is used for defining the database structure or schema. It includes commands that create and modify database objects (like tables, schemas, and indexes).

2. Identify the Commands:

   • a. ALTER: This command is part of DDL, used to modify existing database objects.
   • b. SELECT: This command is part of Data Query Language (DQL), not DDL; it retrieves data from a database.
   • c. UPDATE: This command is part of Data Manipulation Language (DML), which modifies existing data in a table.
   • d. INSERT: This command is also part of DML, which adds new data to a table.

3. Conclusion:

   • Among the options presented, only ALTER is categorized under DDL.

Final Answer

a. ALTER is the correct answer as it is a Data Definition Language command.