Menu
Snowflake allows UNIQUE, PRIMARY KEY, FOREIGN KEY and NOT NULL constraints but I read that it enforces only NOT NULL constraint. Then what is the purpose of other keys and under what circumstances do we have to define them? I appreciate any examples.
Thank you, Prashanth.
943
Snowflake provides the following constraint functionality: Unique, primary, and foreign keys, and NOT NULL columns.
INFORMATION_SCHEMA. TABLE_CONSTRAINTS can give the information of the constraint but then joining it with INFORMATION_SCHEMA. TABLES and INFORMATION_SCHEMA. COLUMNS will show me the constraint on the whole table rather than the column on which PK exists.
Check Foreign Key In Snowflake, foreign key constraint is not enforced. You can insert values in tables that are not present in the parent table or reference table. Below statement will insert record to the table; insert into fk_demo_table values (100,'A2A','ZZZ');
They express intent, helping people understand your data models. Data modeling tools can use them to generate diagrams. You can also programmatically access them to validate data integrity yourself.
102
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
