Question

_ _ _ _ language is used to define the logical, external and physical schemas and access authorizations.

• A. Data Manipulation Language (DML)
• B. Data Definition Language (DDL)
• C. Logical Definition Language (LDL)
• D. Data-Driven Language (DDL)

Hint:

Remember: DDL defines the structure, while DML manipulates the data. If the question asks about creating tables, schemas, or database design, think of DDL.

Answer 1

The Correct Option is B

Concept: A Database Management System (DBMS) provides different categories of languages for managing databases. Each language is designed for a specific purpose.
• Data Definition Language (DDL): Used to define, create, modify, and remove database structures such as schemas, tables, indexes, views, and constraints.
• Data Manipulation Language (DML): Used to retrieve, insert, update, and delete data stored inside database tables.
• Logical Definition Language (LDL): Not a standard DBMS language category.
• Data-Driven Language: Not recognized as a standard database language used for schema definition.

Step 1: Understanding the role of schemas in a database. A schema is the overall design or blueprint of a database. Database systems generally deal with:
• Physical Schema
• Logical (Conceptual) Schema
• External Schema These schemas describe how data is stored, organized, and presented to users.

Step 2: Determining which language defines schemas. The language responsible for creating and defining database structures is Data Definition Language (DDL). Examples of DDL commands include: \[ \texttt{CREATE, ALTER, DROP, TRUNCATE} \] These commands establish the structure of the database and therefore define schemas.

Step 3: Understanding access authorization. Access authorization refers to permissions and privileges granted to users. Database systems use definition-related commands and authorization mechanisms to establish who can access various database objects. Thus, schema definition and authorization management are associated with DDL-related database administration functions.

Step 4: Eliminating incorrect options.
• DML works with data, not schema definitions.
• LDL is not a standard database language.
• Data-Driven Language is not a recognized schema-definition language. Therefore, the language used to define logical, external, and physical schemas along with access authorizations is: \[ \boxed{\text{Data Definition Language (DDL)}} \]