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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.
6 Μαΐ 2015 · select case when usr.pr_user_id is null then 'no pr_user' else usr.name end as primary_user_name from user usr where usr.user_id=usr.pr_usr_id;
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.
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. Table of Contents. What Does the SQL CASE Statement Do? SQL CASE Statement Syntax. Parameters of the CASE Statement.
This Oracle tutorial explains how to use the Oracle / PLSQL CASE statement with syntax and examples. The Oracle / PLSQL CASE statement has the functionality of an IF-THEN-ELSE statement. Starting in Oracle 9i, you can use the CASE statement within a SQL statement.
7 Δεκ 2023 · How to use CASE for IF-THEN logic in SQL SELECT. If you want to see the grade for each exam, select the case expression like a regular column: It’s a good idea to give the expression an alias. This is particularly important if the case is in a subquery.
Script Name Simple SQL CASE example. Description In this simple CASE expression, Oracle Database evaluates the first WHEN and returns the THEN if satisfied. It next considers the next WHEN condition. If none of the when conditions are met the ELSE is taken. Area SQL General.
