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Oracle CASE expression allows you to add if-else logic to SQL statements without having to call a procedure. The CASE expression evaluates a list of conditions and returns one of the multiple possible results. You can use a CASE expression in any statement or clause that accepts a valid expression.
CASE expressions let you use IF ... THEN ... ELSE logic in SQL statements without having to invoke procedures. The syntax is: 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 ...
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.
Summary: in this tutorial, you will learn how to use the PL/SQL CASE statement to control the flow of a program. The CASE statement chooses one sequence of statements to execute out of many possible sequences. The CASE statement has two types: simple CASE statement and searched CASE statement.
The simple CASE statement evaluates a single expression and compares it to several potential values. The searched CASE statement evaluates multiple Boolean expressions and chooses the first one whose value is TRUE.
The CASE statement evaluates a single expression and compares it against several potential values, or evaluates multiple Boolean expressions and chooses the first one that is TRUE. Syntax. searched_case_statement ::= [ <<label_name>> ] CASE { WHEN boolean_expression THEN {statement;} ... }... [ ELSE {statement;}... ] END CASE [ label_name ...
28 cze 2024 · This Tutorial explains how to use the PL/SQL case statement, including simple case & searched case with Syntax, Examples & Code Explanation for better Understanding.
