TOPIC OVERVIEW

mysql/Functions and Operators

Use MySQL's built-in tools to calculate values, transform data, compare results, and build smarter queries.

18 QuestionsIntermediateHigh Priority ~12 min read

MySQL provides a large collection of functions and operators that can be used directly inside SQL queries. You can perform calculations, manipulate strings, work with dates, handle NULL values, and calculate aggregates without moving the data into your application first.

Operators such as comparison, logical, arithmetic, and conditional operators let you build more expressive queries. Knowing which work should happen inside MySQL and which belongs in application code can also make your backend simpler and more efficient.

What you'll walk away knowing

How arithmetic, comparison, and logical operators work

How string and date functions transform data

How aggregate functions such as COUNT and SUM work

How NULL-aware functions and conditional expressions behave

1Explain how collation affects comparison operators in string functions.Intermediate 2Can functions be used in the WHERE clause? What are the performance implications?Intermediate 3What are logical operators in MySQL, and how do AND, OR, and NOT work?Beginner 4What is the difference between IFNULL() and COALESCE() functions?Beginner 5How do aggregate functions like AVG(), SUM(), and MAX() behave when NULLs are present?Intermediate 6What is the difference between the = and <=> operators?Intermediate 7Explain the difference between NOW(), CURDATE(), and SYSDATE().Beginner 8What is the difference between ROUND(), TRUNCATE(), and FORMAT() functions?Intermediate 9What are user-defined functions (UDFs), and how do they differ from stored procedures?Intermediate 10What is the use of the CONCAT() function? How is it different from using ||?Intermediate 11What are window functions in MySQL 8.0, and how do they differ from aggregate functions?Intermediate 12What are the differences between DATE_ADD() and ADDDATE() functions?Beginner 13Explain the use of REGEXP and LIKE operators. What’s the difference between them?Intermediate 14Give examples of commonly used string functions in MySQL.Beginner 15What are arithmetic operators in MySQL? Give examples.Beginner 16What does the DISTINCT keyword do when used with aggregate functions like COUNT()?Intermediate 17How does MySQL internally optimize and cache results of deterministic functions?Advanced 18What are deterministic and non-deterministic functions? How does this affect replication and indexes?Intermediate 19How does MySQL handle type conversion when using operators on different data types?Intermediate 20Explain the difference between RANK(), DENSE_RANK(), and ROW_NUMBER() window functions.Intermediate 21What are comparison operators in MySQL, and how are they used with NULL values?Intermediate 22What is the difference between single-row functions and aggregate functions?Intermediate 23Explain how CASE and IF() functions can be used for conditional logic.Intermediate 24How does MySQL evaluate operator precedence when multiple operators are used in a single expression?Intermediate 25How would you combine multiple functions and operators to clean, transform, and aggregate data efficiently in one query?Intermediate 26What are functions and operators in MySQL, and how are they different?Intermediate 27What are the performance trade-offs of using scalar functions inside JOIN or GROUP BY clauses?Intermediate 28How can you use STR_TO_DATE() and DATE_FORMAT() for converting and displaying date values?Intermediate 29How can you use JSON_EXTRACT() and JSON_CONTAINS() to work with JSON data in MySQL?Intermediate 30What is the difference between LENGTH() and CHAR_LENGTH() functions?Intermediate

All Topics

1

2

Functions and Operators

3

4

Sharethis topic

Share via WhatsApp, X, Facebook, LinkedIn or copy link. Open Graph preview enabled.