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6 Μαΐ 2015 · you can try following query:-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;
For example, you can use the CASE expression in statements such as SELECT, UPDATE, or DELETE, and in clauses like SELECT, WHERE, HAVING, and ORDDER BY. Oracle CASE expression has two formats: the simple CASE expression and the searched CASE expression. Both formats support an optional ELSE clause.
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.
For example, database triggers (code that is attached to tables discussed in Chapter 13, “Trig-gers,” and Chapter 14, “Mutating Tables and Compound Triggers”) on the server side and the logic behind an Oracle form on the client side can be written using PL/SQL.
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.
The CASE function specifies conditions and results for a select or update statement. You can use the CASE function to search for data based on specific conditions or to update values based on a condition. Example. SELECT CASE JOB WHEN 'PRESIDENT' THEN 'The Honorable' WHEN 'MANAGER' THEN 'The Esteemed' ELSE 'The good' END, ENAME FROM EMP;
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.
