Which of the following provides the ability to query information from the database and insert tuples into, delete tuples from, and modify tuples in the database ?

Question

Accepted Answer

The correct option is (1):
DML (Data Manipulation Language) is the correct answer because it is the specific subset of the Structured Query Language (SQL) designed explicitly for managing the data stored within a relational database. The question describes the four fundamental operations of DML: querying information using the `SELECT` command, inserting new records (tuples) using `INSERT`, deleting existing records with `DELETE`, and modifying records via `UPDATE`. These four commands collectively form the backbone of data interaction, often referred to as the CRUD operations (Create, Read, Update, Delete). DML allows database users and applications to change and retrieve the actual contents of the database tables, fulfilling all the requirements mentioned in the prompt.

The incorrect option is (2):
DDL (Data Definition Language) is incorrect because it is concerned only with defining the *structure* or schema of the database, not manipulating the data itself. DDL commands include `CREATE`, `ALTER`, and `DROP`, which are used to build tables, change their columns, or completely remove them. While it sets the stage, DDL does not have commands like `INSERT` or `UPDATE` to modify the row-level data within the tables. Therefore, DDL’s focus is on the database architecture, which is separate from the content manipulation detailed in the question.

The incorrect option is (3):
Query is incorrect as it is a general term for a request for data, and in SQL, it primarily refers to the `SELECT` command. Although querying information is one of the abilities mentioned in the question, the term itself fails to encompass the complete set of required functions. The set of all operations, including inserting, deleting, and modifying data, requires the broader definition of a language subset, which is DML. Thus, "Query" represents only a part of the functionality, not the entire language.

The incorrect option is (4):
Relational Schema is incorrect because it is a descriptive object, not an active language component. The Relational Schema is essentially the logical blueprint of the database, which defines the tables, their attributes (columns), data types, and the relationships between them. It is a static set of rules that governs the data structure. It is the structure *upon which* DML operations are performed, but it cannot perform the operations itself.