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Relational Database and DBMS Quiz

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Questions and Answers

What is the primary purpose of a primary key in a relational database table?

Sorting data alphabetically

Defining table relationships

Creating backup copies

Ensuring data uniqueness (correct)

In a relational database, which of the following is NOT a key concept?

Array (correct)

Tuple

Table

Attribute

Which SQL command is used to delete a table from a database?

DROP TABLE (correct)

ERASE TABLE

REMOVE TABLE

DELETE TABLE

In a relational database, what is the purpose of the primary key?

To uniquely identify each row in a table Signup and view all the answers

Which SQL command is used to modify existing data in a table?

UPDATE Signup and view all the answers

What does the WHERE clause in an SQL query specify?

The conditions for selecting rows Signup and view all the answers

In a relational database, what is the primary purpose of a primary key?

Ensuring data integrity Signup and view all the answers

Which SQL command is specifically used to create a new table in a relational database?

CREATE TABLE Signup and view all the answers

What does SQL stand for in the context of relational databases?

Structured Query Language Signup and view all the answers

In a relational database, what happens when a foreign key is used?

Link to another table's primary key Signup and view all the answers

Study Notes

Primary Key in Relational Databases

Serves as a unique identifier for each record in a table, ensuring that no duplicate entries exist.
Provides a way to establish and enforce referential integrity within the database.

Key Concepts in Relational Databases

Concepts typically include tables, rows, columns, primary keys, foreign keys, indices, and relationships. Items not fitting these categories may include non-relational structures.

SQL Commands for Table Management

The command DROP TABLE is used to delete a table from a database permanently.
To create a new table, the CREATE TABLE command is utilized, defining the table structure and fields.

Modifying Data in a Table

The SQL command UPDATE is employed to modify existing data within a specified table.

WHERE Clause in SQL Queries

The WHERE clause filters records to specify which rows should be retrieved or affected, based on certain criteria.

Foreign Key Functionality

A foreign key creates a link between two tables, establishing a relationship that allows for cross-referencing data, while enforcing referential integrity.

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Description

Test your knowledge about relational databases, primary keys, and DBMS models with this quiz. Determine the correct definitions and concepts related to database structures and relationships.