The identification number should be used as a primary key in a student database. Here's why:

1. Uniqueness: The primary key's main feature is its uniqueness; no two records can have the same primary key. Identification numbers are unique to each student, unlike first names, last names, or ages, which can be shared by multiple students.

2. Consistency: Identification numbers do not change over time. In contrast, a student's first name, last name, or age might change. For example, a student might change their name, or their age will change each year.

3. Non-null: Primary keys cannot be null. An identification number is a required field, whereas some students might not have a last name entered.

4. Minimal: A good primary key is as small as possible, and an identification number (usually a relatively small integer) meets this criterion better than a potentially long string (like a name).

So, the identification number is the best choice for a primary key in a student database.

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The identification number should be used as a primary key in a student database. Here's why:

1. Uniqueness: The primary key's main feature is its uniqueness; no two records can have the same primary key. Identification numbers are unique to each student, unlike first names, last names, or ages, which can be shared by multiple students.

2. Consistency: Identification numbers do not change over time. In contrast, a student's first name, last name, or age might change. For example, a student might change their name, or their age will change each year.

3. Non-null: Primary keys cannot be null. An identification number is a required field, whereas some students might not have a last name entered.

4. Minimal: A good primary key is as small as possible, and an identification number (usually a relatively small integer) meets this criterion better than a potentially long string (like a name).

So, the identification number is the best choice for a primary key in a student database.

Knowee AI · Accepted Answer

The identification number should be used as a primary key in a student database. Here's why:

1. Uniqueness: The primary key's main feature is its uniqueness; no two records can have the same primary key. Identification numbers are unique to each student, unlike first names, last names, or ages, which can be shared by multiple students.

2. Consistency: Identification numbers do not change over time. In contrast, a student's first name, last name, or age might change. For example, a student might change their name, or their age will change each year.

3. Non-null: Primary keys cannot be null. An identification number is a required field, whereas some students might not have a last name entered.

4. Minimal: A good primary key is as small as possible, and an identification number (usually a relatively small integer) meets this criterion better than a potentially long string (like a name).

So, the identification number is the best choice for a primary key in a student database.

Which item should be used as a primary key in a student database?*1 pointfirst nameidentification numberlast nameage

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