
SQL Functions and Joins Quiz
Authored by Benhar undefined
Information Technology (IT)
University

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32 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the MIN function do in SQL?
Returns the maximum value
Returns the minimum value
Calculates the average value
Counts the number of rows
Answer explanation
The MIN function in SQL is used to return the minimum value from a set of values in a specified column. Therefore, the correct answer is 'Returns the minimum value'.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which SQL function would you use to find the total of a column?
MIN
COUNT
SUM
AVG
Answer explanation
The SUM function in SQL is specifically designed to calculate the total of a numeric column. Unlike MIN, COUNT, and AVG, which serve different purposes, SUM directly provides the total value of the specified column.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the result of the query SELECT COUNT(OrderID) FROM Orders?
2
5
4
3
Answer explanation
The query SELECT COUNT(OrderID) counts the number of entries in the Orders table. The correct answer is 4, indicating there are four orders recorded in the database.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the AVG function calculate?
The total of all values
The minimum value
The average of a specified column
The maximum value
Answer explanation
The AVG function calculates the average of a specified column by summing all the values in that column and dividing by the count of those values, making 'The average of a specified column' the correct choice.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which SQL command is used to group results by one or more columns?
HAVING
JOIN
GROUP BY
ORDER BY
Answer explanation
The correct command to group results by one or more columns in SQL is 'GROUP BY'. This command aggregates data based on specified columns, allowing for summary statistics and organized results.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of the HAVING clause in SQL?
To sort the results
To join two tables
To filter records after grouping
To filter records before grouping
Answer explanation
The HAVING clause is used in SQL to filter records after they have been grouped by the GROUP BY clause. This allows for conditions to be applied to aggregated data, making it essential for refining results based on group calculations.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the YEAR function return?
The current date
The four-digit year
The day of a date
The month of a date
Answer explanation
The YEAR function extracts the four-digit year from a given date. Therefore, the correct answer is 'The four-digit year', as it specifically returns the year component, not the full date, day, or month.
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