Discussion
Which normal form removes partial dependency ?
Answer: B
Partial dependency is removed by 2NF.
A partial dependency exists when a non-key attribute depends on only part of a composite primary key. In ORDER_ITEM(order_id, product_id, quantity, product_name), product_name depends on product_id alone. A relation is in second normal form when it is in 1NF and has no such dependency; the fix is to move product_name into a separate PRODUCT table.
1NF only requires atomic values. 3NF removes transitive dependencies (a non-key attribute depending on another non-key attribute), and BCNF requires every determinant to be a candidate key. Both assume partial dependencies are already gone.
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