This quiz will test your understanding of how to retrieve data from MySQL databases using the SELECT statement. You will explore key concepts such as selecting specific columns, using wildcards, filtering results with LIMIT and OFFSET, eliminating duplicates with DISTINCT, sorting with ORDER BY, and applying aggregate functions like SUM(), AVG(), and COUNT().
By completing this quiz, you will reinforce your knowledge of essential SQL queries that help efficiently extract and manipulate data from MySQL tables.
1.
What does the following query return?
SELECT DISTINCT description FROM product;
2.
Which clause is used to sort query results?
3.
What does the OFFSET keyword do in a SELECT statement?
4.
Which keyword is used to limit the number of rows returned by a SELECT query?
5.
Which function calculates the total sum of values in a column?
6.
Which SQL function returns the lowest value in a column?
7.
Which wildcard symbol is used in a SELECT statement to retrieve all columns from a table?
8.
How do you sort query results in descending order?
9.
What does the following query do?
SELECT name, SUM(price * quantity) AS total FROM product GROUP BY name ORDER BY total;
10.
Which SQL keyword allows renaming a column in a query result?
11.
What is the primary purpose of the SELECT statement in MySQL?
12.
Which keyword is used to remove duplicate values from a SELECT query result?
13.
Which keyword is used to group query results based on a column value?
14.
What does the COUNT() function return?
15.
Which function is used to calculate the average of column values?
16.
Which function returns the highest value in a column?
17.
How can you retrieve only the first two rows from a table?
18.
What is the correct syntax to retrieve multiple columns from a table?
19.
What is an alternative way to use LIMIT with OFFSET?
20.
How can you retrieve a single column from a table using the SELECT statement?
