1. A table is in 2nf if the table is in 1nf and what other condition is met? Mark for review (1) points there are no null values in primary key fields. There are no attributes that are not functionally dependent on the relation's entire primary key. There are no repeating groups. There are no functional dependencies.
Answers
Answer:
Where are primary key on Repeating groups or no functional dependencies
A table is in 2NF (Second Normal Form) if the table is in 1NF (First Normal Form) and there are no attributes that are not functionally dependent on the relation's entire primary key. Therefore, the correct answer is: "There are no attributes that are not functionally dependent on the relation's entire primary key."
In order to understand 2NF, it's important to first understand 1NF. First Normal Form requires that a table has a primary key, and that each attribute within that table is atomic (indivisible). In other words, each attribute should only contain one value, and cannot be broken down into multiple values.
Once a table meets the requirements of 1NF, we can then move on to 2NF. 2NF requires that there are no attributes in the table that are dependent on only a portion of the primary key. In other words, every non-primary key attribute in the table must be dependent on the entire primary key, not just a part of it.
For example, let's say we have a table of customer orders, with columns for order ID, customer ID, product name, and product price. The primary key for this table is the combination of order ID and customer ID. In this table, the product name and product price are dependent solely on the order ID, and not on the customer ID. This means that the table is not in 2NF, because some of the attributes are dependent only on a portion of the primary key.
To bring the table to 2NF, we would split it into two tables: one for orders, with columns for order ID and customer ID, and one for products, with columns for product ID, product name, and product price. This way, each attribute is dependent on the entire primary key of its respective table, and the tables are in 2NF.
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