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Data Independence and Types Quiz

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Questions and Answers

What is data independence?

The ability to modify or change schema definition without affecting application programs.

The ability to modify or change schema definition at any level.

The ability to modify or change schema definition without affecting any other schema definition.

The ability to modify or change schema definition of one level without affecting schema definition in the next higher level. (correct)

What is logical data independence?

Ability to modify the logical schema without affecting the external schema or application programs. (correct)

Ability to modify the logical schema without affecting the physical schema or application programs.

Ability to modify the application programs without affecting the logical schema or external schema.

Ability to modify the external schema without affecting the logical schema or application programs.

What is physical data independence?

Ability to modify the application programs without affecting the physical schema or logical schema.

Ability to modify the physical schema without affecting the logical schema or application programs. (correct)

Ability to modify the physical schema without affecting any other schema definition.

Ability to modify the logical schema without affecting the physical schema or application programs.

What is the syntax of the `ALTER` command?

ALTER TABLE ADD ( ); Signup and view all the answers

What does the `ALTER` command do?

Adds a new column to the existing table. Signup and view all the answers

Match the following terms with their definitions:

Data Independence = The ability to modify or change schema definition of one level without affecting schema definition in the next higher level. Logical Data Independence = Ability to modify the logical schema without affecting the external schema or application programs. Physical Data Independence = Ability to modify the physical schema without affecting the logical schema or application programs. ALTER command = Syntax: ALTER TABLE ADD (); Example: ALTER TABLE student ADD (age NUMERIC(2)); This command adds a new column to the existing table. Signup and view all the answers

Match the following programming languages with their primary usage:

Python = General-purpose programming JavaScript = Client-side scripting for web applications SQL = Database queries CSS = Styling web pages Signup and view all the answers