ISNULL in Snowflake - Examples & AI Generator

The ISNULL function in Snowflake is essential for handling missing or NULL values in your SQL queries. However, ISNULL syntax and behavior can differ across SQL databases, often causing confusion or errors for developers switching to Snowflake. With AI2sql, you no longer need to memorize Snowflake-specific functions—just describe your requirement in plain English and instantly generate production-ready ISNULL queries with no coding required. Join 50,000+ users across 80+ countries who save hours each week with AI2sql.

ISNULL Syntax in Snowflake

Basic Syntax

ISNULL(<expr>

• <expr>: The value or column to check for NULL. Returns TRUE if the expression is NULL.

Snowflake-Specific Note

Unlike some databases, Snowflake also provides NVL() and COALESCE() for substituting default values. ISNULL is mainly used to check if a value is NULL and returns a boolean.

ISNULL Examples You Can Generate Instantly

1. Identify Customers With Missing Email Addresses

SELECT customer_id, email
FROM customers
WHERE ISNULL(email);

2. Find Orders Missing Delivery Dates

SELECT order_id, order_date
FROM orders
WHERE ISNULL(delivery_date);

3. Flag Products With No SKU Assigned

SELECT product_id, product_name
FROM products
WHERE ISNULL(sku);

Generate ISNULL queries in 10 seconds with AI2sql

Why Use AI2sql Instead of Manual ISNULL Coding

• Instant Generation: Skip syntax checks and manual typing.

• Error-Free: Avoid mistakes with Snowflake's ISNULL and NULL logic.

• No Coding Required: Describe your query in plain language—AI2sql handles the rest.

• Consistent Output: Quickly create queries across ISNULL, NVL, and COALESCE functions without changing your workflow.

Prefer visual query-building? Try AI2sql Generator or learn more at Learn ISNULL.

Frequently Asked Questions

Does Snowflake ISNULL return a boolean or replacement value?

In Snowflake, ISNULL returns TRUE if the value is NULL and FALSE otherwise. To substitute a replacement value, use NVL() or COALESCE().

What’s the difference between ISNULL, NVL, and COALESCE in Snowflake?

ISNULL checks for NULL and returns a boolean. NVL and COALESCE return the first non-NULL value among arguments, making them ideal for data substitution.

Can I use ISNULL in SELECT as well as WHERE clauses?

Yes. Use ISNULL in WHERE for filtering, or in SELECT to create boolean flags for missing values.

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