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16 Ιαν 2024 · 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. Other programming languages use similar logic – e.g. Python uses if , elif , and else , and JavaScript uses the switch statement.
2 Ιουν 2023 · The SQL CASE statement allows you to perform IF-THEN-ELSE functionality within an SQL statement. Learn more about this powerful statement in this article. This article applies to Oracle, SQL Server, MySQL, and PostgreSQL.
The SQL CASE Expression. The CASE expression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in the ELSE clause.
SQL for Data Analysis Cheat Sheet. SQL, or Structured Query Language, is a language for talking to databases. It lets you select specific data and build complex reports. Today, SQL is a universal language of data, used in practically all technologies that process data. SELECT.
Throughout this guide, we’ve covered the basics of SQL CASE WHEN statements, explored beginner, intermediate, and advanced examples, and discussed best practices for optimizing your queries. By understanding the syntax and various use cases, you can simplify complex queries, improve their readability, and optimize performance.
2 Νοε 2023 · The SQL CASE statement ends when it hits the first condition that evaluates to true. If no condition is met, the CASE expression can return a default value, often specified by an ELSE clause. If the ELSE clause is omitted and no condition is true, the result of the CASE expression is NULL.
20 Απρ 2021 · ELSE statements into your Microsoft SQL Server T-SQL code. CASE is used within a SQL statement, such as SELECT or UPDATE. Don’t mistake CASE for the IF ELSE control of flow construct, which is used to evaluate the conditional execution of SQL statements. Let’s illustrate with an example.
