Explanation:
Delta Lake does not natively enforce primary key uniqueness constraints. To achieve primary key-like behavior, data engineers must ensure data integrity by deduplicating records before or during the write operation and enforcing NOT NULL constraints on the columns that comprise the logical primary key.
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What approach can be used to simulate primary key enforcement in a Delta Lake table, given that traditional primary key constraints are not natively enforced at the engine level?
A
Apply foreign key references to maintain referential integrity across multiple tables.
B
Define the primary key constraint explicitly within the Delta schema's metadata for automatic enforcement.
C
Utilize a combination of NOT NULL and UNIQUE constraints within the table definition during creation.
D
Perform data deduplication during the ETL process (e.g., using MERGE or dropDuplicates) and apply NOT NULL constraints to identifying columns.
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