CASE WHEN in Oracle - Examples & AI Generator

Mastering the CASE WHEN statement in Oracle SQL can be complex, especially when dealing with nested conditions or large reports. Oracle’s syntax has subtle differences from other databases, making it tricky for those who switch between SQL flavors. With AI2sql - AI SQL Generator, you can skip memorizing complicated logic and generate production-ready CASE WHEN queries in seconds—no coding required.

CASE WHEN Syntax in Oracle

Basic Structure

CASE
    WHEN condition THEN result
    [WHEN ...]
    [ELSE default_result]
END

• Oracle allows multiple WHEN conditions inside a CASE block.

• Always close with END.

• Use ELSE to catch all unmatched cases (optional).

CASE WHEN Examples You Can Generate Instantly

Customer Loyalty Category

SELECT customer_name,
       total_orders,
       CASE
         WHEN total_orders >= 20 THEN 'Platinum'
         WHEN total_orders >= 10 THEN 'Gold'
         WHEN total_orders >= 5 THEN 'Silver'
         ELSE 'Bronze'
       END AS loyalty_tier
FROM customers;

Order Status Mapping

SELECT order_id,
       status_code,
       CASE status_code
         WHEN 'S' THEN 'Shipped'
         WHEN 'P' THEN 'Processing'
         WHEN 'C' THEN 'Cancelled'
         ELSE 'Unknown'
       END AS order_status
FROM orders;

Product Discount Flag

SELECT product_name,
       price,
       discount,
       CASE
         WHEN discount > 0 THEN 'Discounted'
         ELSE 'Full Price'
       END AS price_type
FROM products;

Generate CASE WHEN queries in 10 seconds with AI2sql

Why Use AI2sql Instead of Manual CASE WHEN Coding

• Instant generation: No more syntax errors or manual lookups.

• Oracle-specific SQL: Automatically applies correct Oracle CASE WHEN syntax.

• No coding required: Just describe your condition; get production-ready code.

• Trusted by 50,000+ users across 80+ countries.

Save hours, especially when switching between SQL dialects or managing complex business logic. Try AI2sql Generator or Learn CASE WHEN for more examples and learning resources.

FAQ: CASE WHEN in Oracle

How is CASE WHEN syntax different in Oracle?

Oracle supports both searched (using conditions) and simple (comparing against a single expression) CASE WHEN syntax. Always end with END. ELSE is optional but best practice.

Can I nest CASE WHEN statements in Oracle?

Yes, Oracle allows nesting CASE WHEN statements—though using AI2sql makes building and maintaining them effortless.

Why does Oracle recommend CASE over DECODE?

CASE WHEN is ANSI SQL standard, more readable, and supports complex conditions—while DECODE is limited and non-standard.

Ready to skip manual coding and generate a custom CASE WHEN query for Oracle in seconds? Generate Your First Query Now.