
УПР 91-120
Quiz
•
Information Technology (IT)
•
University
•
Easy
Нұрдәулет Қазбеков
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30 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main advantage of using an index in a database?
It reduces storage requirements
It prevents duplicate record
It speeds up query execution
It improves data integrity
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of a foreign key in a relational database?
To enforce uniqueness in a table
To store temporary data
To establish relationships between tables
To improve performance of SELECT queries
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which SQL clause is used to filter results after aggregation?
WHERE
ORDER BY
HAVING
GROUP BY
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the difference between INNER JOIN and LEFT JOIN?
INNER JOIN includes all rows from both tables
LEFT JOIN returns only matching rows from both tables
LEFT JOIN returns all rows from the left table and matching rows from the right table
INNER JOIN is used only for one-to-one relationships
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of normalization in databases?
To store data in a single table
To speed up all queries
To reduce data redundancy and improve consistency
To avoid using indexes
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which command is used to list all databases in postgresql?
SHOW DATABASES;
SELECT * FROM pg_databases;
\l
DESCRIBE DATABASES;
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of the EXPLAIN ANALYZE command in postgresql?
To list all tables in a database
To create a new index
To show the execution plan and performance details of a query
To modify an existing table
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