Understanding CASE And DECODE In SQL: Conditional Logic Made Easy
Learn CASE & DECODE in SQL: Conditional logic made easy! Use CASE for complex conditions & portability, DECODE for simpler equality checks in Oracle SQL.
Understanding CASE and DECODE in SQL
In SQL, particularly in Oracle SQL, CASE and DECODE are both used for implementing conditional logic within queries. They help in transforming or interpreting data based on specific conditions.
What is CASE?
Definition: The CASE statement is a conditional expression that allows you to evaluate multiple conditions and return different values based on the results of those evaluations. It can be thought of as an SQL equivalent of IF-THEN-ELSE logic.
Syntax:
CASE
WHEN condition1 THEN result1
WHEN condition2 THEN result2
...
ELSE default_resu...