Converting a table into second normal form (2NF) only applies to a table that has a composite key.

Name: Converting a table into second normal form (2NF) only applies to a table that has a composite key.
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A table must have a composite primary key (a primary key consisting of more than one attribute) for the concept of second normal form (2NF) to apply, as 2NF addresses the issue of partial dependency on a part of the composite primary key.

Converting a Table into Second Normal Form (2NF) Only Applies