Snowflake SnowPro Certification Practice Test

What is the only constraint that Snowflake enforces?

1. Uniqueness

2. NOT NULL

3. Referential Integrity

4. Primary Keys

The correct answer is: NOT NULL

Snowflake enforces the NOT NULL constraint, which ensures that a column cannot contain null values. This is essential for scenarios where it is critical to have a value present in the specified column for every record. The NOT NULL constraint helps maintain data integrity by requiring that necessary data is always available. While other constraints like uniqueness, referential integrity, and primary keys are crucial for various data management scenarios, Snowflake does not enforce them at the database level. Instead, uniqueness and primary keys can be defined, but they will not reject duplicate entries or ensure that relationships between tables are enforced. Referential integrity is similarly a concept that can be designed into the schema but is not actively enforced by Snowflake. Therefore, NOT NULL stands out as the only constraint that Snowflake actively enforces, ensuring that designated columns always contain valid data.