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Definition and Usage. The CASE statement goes through conditions and return 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 will return the value in the ELSE clause.
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This tutorial shows you how to use the Oracle CASE expression including simple and searched CASE expression to add if-else logic to the SQL statements.
7 Μαΐ 2017 · 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. The result it returns is based on whether the data meets certain criteria.
In a simple CASE expression, Oracle Database searches for the first WHEN... THEN pair for which expr is equal to comparison_expr and returns return_expr. If none of the WHEN... THEN pairs meet this condition, and an ELSE clause exists, then Oracle returns else_expr. Otherwise, Oracle returns null.
17 Αυγ 2021 · In SQL, the CASE statement returns results based on the evaluation of certain conditions. It is quite versatile and can be used in different constructs. It's a simple yet powerful way to make your data adapt and respond to various scenarios, making your database queries more dynamic and insightful.
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.
13 Ιουν 2021 · 7 Answers. Sorted by: 82. The complete syntax depends on the database engine you're working with: For SQL Server: CASE case-expression. WHEN when-expression-1 THEN value-1. [ WHEN when-expression-n THEN value-n ... [ ELSE else-value ] END. or: CASE. WHEN boolean-when-expression-1 THEN value-1. [ WHEN boolean-when-expression-n THEN value-n ...
