
Database and SQL Concepts Quiz
Quiz
•
Computers
•
12th Grade
•
Practice Problem
•
Hard
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78 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of a database?
To store data in a structured format
To allow complex data operations and transactions
To organize data for easy retrieval
All of the above
Answer explanation
The primary purpose of a database is to store data in a structured format, allow complex data operations and transactions, and organize data for easy retrieval. Therefore, the correct answer is 'All of the above'.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the term 'relation' refer to in a relational database model?
A table
A relationship between tables
A row of data
A column of data
Answer explanation
In a relational database model, the term 'relation' specifically refers to a table. Each table consists of rows and columns, where rows represent records and columns represent attributes of the data.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a valid relational database key?
Tuple
Attribute
Primary key
Cardinality
Answer explanation
A primary key is a valid relational database key that uniquely identifies each record in a table. Tuple, attribute, and cardinality are not keys; they refer to different concepts in database terminology.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the meaning of 'degree' in a relational database?
The number of rows in a table
The number of attributes in a relation
The number of tables in a database
The number of keys in a relation
Answer explanation
In a relational database, 'degree' refers to the number of attributes (columns) in a relation (table). Therefore, the correct answer is 'The number of attributes in a relation', as it defines the structure of the table.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which key uniquely identifies each tuple in a relational database table?
Foreign key
Candidate key
Primary key
Alternate key
Answer explanation
The primary key uniquely identifies each tuple in a relational database table, ensuring that no two rows have the same key value. Other keys, like foreign keys and candidate keys, serve different purposes in database relationships.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary difference between a primary key and a candidate key?
A primary key can have multiple values, but a candidate key cannot
A candidate key can be chosen as a primary key, but a primary key cannot be a candidate key
A candidate key uniquely identifies records, but the primary key does not
A primary key is a combination of multiple candidate keys
Answer explanation
A candidate key is a potential primary key that can uniquely identify records in a table. The primary key is the chosen candidate key, while a primary key cannot serve as a candidate key itself, as it is already designated.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a relational database, the cardinality of a relation refers to:
The number of tuples in a relation
The number of attributes in a relation
The number of foreign keys
The number of columns in a table
Answer explanation
In a relational database, cardinality refers to the number of tuples (rows) in a relation (table). Therefore, the correct answer is 'The number of tuples in a relation', as it directly defines the size of the dataset.
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