Your cousin asks you to help her prepare for her computer science exam next week.
She gives you two clues about a type of relational database key: No column values
may be NULL, and columns must be necessary for uniqueness. Which type of key is
she referring to? Select one answer.
Simple primary key
Alternate key
Foreign key
Composite primary key

Question

UpStudy AI · Accepted Answer

The clues provided by your cousin indicate that the key in question must have the following characteristics:

1. No column values may be NULL.
2. Columns must be necessary for uniqueness.

Based on these characteristics, the type of key she is referring to is a **Simple primary key**.

Here's a brief explanation of the options:

- **Simple primary key**: This is a single column that uniquely identifies each row in a table and cannot contain NULL values.
- **Alternate key**: This is a column or a set of columns that can also uniquely identify a row but is not the primary key. It can potentially allow NULL values.
- **Foreign key**: This is a column or a set of columns in one table that refers to the primary key in another table. It can contain NULL values.
- **Composite primary key**: This consists of two or more columns that together uniquely identify a row in a table. Like a simple primary key, it cannot contain NULL values.

Since the question specifies that the key must be necessary for uniqueness and cannot have NULL values, the correct answer is **Simple primary key**.
She is referring to a **Simple primary key**.

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