Question

Which of the following fields would you most likely index but set the index's Unique property to No?

a.junction tableb.secondary keyd. LastNamed.alternate key

Answer 1

In database design, a junction table would most likely be indexed but with the Unique property set to No because it contains foreign keys from two tables that can have duplicate values, given many-to-many relationships.

Step-by-step explanation:

If you're designing a database and considering which fields might require an index with the Unique property set to No, the correct choice would be a junction table. Junction tables, also known as associative or linking tables, are used in many-to-many relationships between two tables to join them together. Each record in a junction table typically contains the primary keys from the two connecting tables, known as foreign keys. Since these foreign keys will often repeat (as a single record on one side of the relationship can have many associated records on the other side), the Unique property for these indexes should be No to allow for duplicate values.

In contrast, fields such as Last Name would likely not be indexed with the Unique property set to No, because last names are not typically used to uniquely identify records in a database. A secondary key or an alternate key would usually be set with the Unique property set to Yes to ensure that each value in the column is unique and can thus serve as an alternative means to uniquely identify a record.

Answer 2

You would most likely index a junction table but set the index's Unique property to No so the correct option is option a.

Step-by-step explanation:

The field that you would most likely index but set the index's Unique property to No is the junction table.

A junction table is a table that connects two other tables in a many-to-many relationship. It is used to break down the relationship into two one-to-many relationships.

By setting the index's Unique property to No, you are allowing duplicate values in the field, which is necessary for a junction table because it can contain multiple records with the same values.