GREATEST in Oracle - Examples & AI Generator

The GREATEST function in Oracle is essential for developers who need to compare two or more expressions and return the largest value. However, differences in SQL syntax across databases can make it tricky to remember the right way to use GREATEST in Oracle. Whether you're analyzing customer order values or evaluating inventory numbers, getting the syntax right is crucial—and even a small error can slow you down. AI2sql skips manual syntax lookup and helps you generate GREATEST queries for Oracle in just seconds—no coding required.

GREATEST Syntax in Oracle

The Oracle GREATEST function returns the largest value from a list of expressions. Its typical use is:

GREATEST(expr1, expr2, expr3, ...)

• Each expression should be of the same data type or implicitly convertible.

• If any argument is NULL, the result is NULL.

• Oracle's GREATEST does not accept date and character type mixing.

GREATEST Examples You Can Generate Instantly

Here are practical GREATEST Oracle examples you can copy and adapt for business needs:

1. Find the highest sales amount per region

SELECT region,
       GREATEST(q1_sales, q2_sales, q3_sales, q4_sales) AS max_quarterly_sales
FROM sales_summary;

2. Compare customer order values to highlight highest spend

SELECT customer_id,
       GREATEST(order1_total, order2_total, order3_total) AS largest_order_value
FROM customer_orders;

3. Inventory check for maximum product count by warehouse

SELECT product_id,
       GREATEST(warehouse_a_qty, warehouse_b_qty, warehouse_c_qty) AS max_inventory
FROM product_stock;

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FAQ: GREATEST in Oracle

Can I use GREATEST with NULL values in Oracle?

No; if any argument is NULL, GREATEST returns NULL. Use NVL to handle missing values if needed.

What's the main difference in GREATEST Oracle syntax vs. other databases?

Oracle evaluates GREATEST arguments strictly by data type. Mixing incompatible types may cause errors, unlike some other SQL dialects.

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