Case When

Maria Durkin

SQL CASE WHEN Explained: 10 Easy Examples for Beginners

The CASE WHEN statement lets us make decisions on our data, categorizing and manipulating records based on specified conditions. Find out how to use CASE WHEN in this article. Imagine you're deciding what to wear for the day. You take out your umbrella if it's raining; if not, you leave it at home. This decision-making procedure is essentially the same as a SQL CASE WHEN statement. In the realm of SQL, the CASE WHEN statement functions much like an if-then-else expression, allowing us to create custom classifications within a query.

Nicole Darnley

How to Use CASE WHEN in GROUP BY

Learn how you can combine SQL CASE WHEN and GROUP BY to create custom categories in your SQL queries. Raw data, by its very nature, is not always human readable. Many times, the data you’re querying is in its most unformatted form. Examples of this include codes for different business departments or product SKUs that represent specific products. To the naked eye, these codes mean nothing, so pulling them into a report is not helpful for the person reading them.

How to Write a CASE Statement in SQL

Problem: You want to use a CASE statement in SQL. Example: You have exam results in the exam table. You need to assign each result to one of the following text values: 'bad result', 'average result', or 'good result'. Bad results are those below 40, good results are those above 70, and the rest are average results. The exam table looks like this: nameresult Toby Shaw56 Casey Watson49 Bennie Lynn23 Lane Sloan70 Steff Fox85 Reggie Ward40 Gail Kennedy66 Brice Mueller90 Solution 1: SELECT name, result, CASE WHEN result 70 THEN 'good result' ELSE 'average result' END AS category FROM exam; The result table looks like this:

Tihomir Babic

How to Use CASE in ORDER BY in SQL

This article will show you how and when to use CASE in an ORDER BY clause. Have you ever used a CASE statement? I’m sure you have, at least in a SELECT statement. But have you ever used it in an ORDER BY clause? No? You will, once I show you how! Don’t worry if you’ve never used a CASE statement. I’ll show and explain it to you with a short example.

Himanshu Kathuria

How to Use CASE in SQL

Updated on: February 19, 2024 If you need to evaluate multiple conditional statements, the SQL CASE statement will do the job. To effectively harness CASE in SQL, grasping its structure and practical uses is key. I'll guide you through real query examples showcasing the power of this versatile statement. Here’s what you need to know to use CASE like a pro. Why is CASE so important in SQL? If you’re analyzing or manipulating data, you’ll often want to define rules based on certain conditions, e.

Andrew Bone

What Is CASE in SQL?

SQL CASE is a very useful expression that provides if-else logic to your SQL queries. It’s a slightly more advanced topic, but you’ll need it when preparing reports – it will deliver massive value to your personal and professional projects. The SQL CASE statement is a control flow tool that allows you to add if-else logic to a query. Generally speaking, you can use the CASE statement anywhere that allows a valid expression – e.

Tihomir Babic

How to Use CASE WHEN With SUM() in SQL

This article will teach you what a CASE WHEN expression is in SQL and how to use it with a SUM() function and a GROUP BY statement. The examples are included to bolster your understanding. The best way to learn about CASE WHEN and how to use it with SUM() is our hands-on course Creating Basic SQL Reports. It contains over 90 interactive exercises that will teach you different techniques how to create complex reports in SQL.

Aldo Zelen

Useful SQL Patterns: Pivoting

As you start coding in SQL, you will use some statements and techniques over and over again. We call these “SQL patterns”. This series will look at the most common SQL patterns and consider how to use them. The concept of pivot in SQL refers to taking the data in table rows and making that data into columns. This is very important in reporting, and it’s easy to do when you use the CASE statement.

Dorota Wdzięczna

Using CASE with Data Modifying Statements

What happens when you combine CASE with SQL's data modifying statements? Find out in this article. The CASE expression is a very useful part of SQL and one that you'll employ frequently. We've already covered what the CASE expression does, how to format it, and how to use it in a SELECT statement in "Using CASE to Add Logic to a SELECT". Another article, "How to Sort Records with the ORDER BY Clause"

Dorota Wdzięczna

Using CASE to Add Logic to a SELECT

As you write an SQL query, you may need to get values from multiple columns and change values from one form to another. The simple way to achieve this goal is to add a CASE expression to your SELECT statement. In this article, we'll introduce you to the syntax, formats, and uses of the CASE expression. The CASE expression is a conditional expression: it evaluates data and returns a result.