Similar to most of the MPP databases, Snowflake cloud database allows you to define constraints. The Snowflake database does not enforce constraints like primary key, foreign key and unique key. But, it does enforce the NOT NULL constraint. In this article, we will check Snowflake NOT NULL constraint, its syntax and usage. Snowflake NOT NULL Constraint Constraints other than NOT NULL are created as disabled. Snowflake enforces only NOT NULL. You can create NOT NULL constraint while creating tables in the cloud database. A Snowflake table can have multiple NOT…

Similar to Snowflake primary key and foreign key, unique key constraint is informational only. It is not enforced when you insert rows to the table. The unique key metadata information is used by the Snowflake optimizer to come up with the optimal execution plan. Snowflake Unique Key Constraint You can create Unique key constraint while creating tables in the Snowflake cloud database but it will not be enforced while loading tables. The Snowflake query planner uses these constraints to create a better query execution plan. Similar to the foreign key,…

Similar to the primary key constraint, the Snowflake foreign key constraint is also information only. It is not enforced when you insert the data into a table. Constraints other than NOT NULL are created as disabled. Snowflake Foreign Key Constraint You can create the foreign key while creating tables on the Snowflake cloud data warehouse. But, foreign key will not be enforced when you load the tables. However, constraints provide valuable metadata. The optimizer uses the foreign keys to create an optimal execution plan. A table can have multiple unique…

For the compatibility with other databases, Snowflake provides the primary key constraint. The primary key constraint is informational only; It is not enforced when you insert the data into a table. Snowflake supports referential integrity constraints such as primary key, foreign key, unique key, and NOT NULL. Snowflake Primary Key Constraint You can create the primary key while creating tables on the Snowflake cloud data warehouse. But, primary key will not be enforced when you load the tables. However, constraints provide valuable metadata. The optimizer uses the primary key to…