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SQL Concepts Quiz

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Questions and Answers

What is the difference between GROUP BY and HAVING?

GROUP BY is used to group rows together based on a specific column, while HAVING is used to filter the results after the grouping has been done.

What is the ORDER BY clause used for?

The ORDER BY clause is used to sort the results of a query in ascending or descending order based on one or more columns.

What is the difference between UNION and JOIN?

UNION is used to combine the results of two or more SELECT statements into a single result set, while JOIN is used to combine rows from two or more tables based on a related column.

What are the different types of joins?

<p>The different types of joins are INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.</p> Signup and view all the answers

What are aggregate functions?

<p>Aggregate functions perform calculations on a set of values and return a single value. Examples include SUM, COUNT, AVG, MIN, and MAX.</p> Signup and view all the answers