A primary key must adhere to the following constraints:

1. Uniqueness: The primary key must contain unique values. No two rows of data can have the same primary key value.

2. Not Null: The primary key must have a value (i.e., it cannot be null). Every row of data must have a primary key value.

3. Immutability: Once a primary key value has been assigned to a row of data, it cannot be changed or modified. This is to ensure that the primary key always uniquely identifies that specific row of data.

4. Single Value: The primary key value must be a single value. It cannot be a set or an array of values.

5. Consistency: The primary key must remain consistent, which means it cannot change over time.

6. There can only be one primary key in a table. However, the primary key can consist of multiple columns, which is known as a composite key.

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A primary key must adhere to the following constraints:

1. Uniqueness: The primary key must contain unique values. No two rows of data can have the same primary key value.

2. Not Null: The primary key must have a value (i.e., it cannot be null). Every row of data must have a primary key value.

3. Immutability: Once a primary key value has been assigned to a row of data, it cannot be changed or modified. This is to ensure that the primary key always uniquely identifies that specific row of data.

4. Single Value: The primary key value must be a single value. It cannot be a set or an array of values.

5. Consistency: The primary key must remain consistent, which means it cannot change over time.

6. There can only be one primary key in a table. However, the primary key can consist of multiple columns, which is known as a composite key.

Knowee AI · Accepted Answer

A primary key must adhere to the following constraints:

1. Uniqueness: The primary key must contain unique values. No two rows of data can have the same primary key value.

2. Not Null: The primary key must have a value (i.e., it cannot be null). Every row of data must have a primary key value.

3. Immutability: Once a primary key value has been assigned to a row of data, it cannot be changed or modified. This is to ensure that the primary key always uniquely identifies that specific row of data.

4. Single Value: The primary key value must be a single value. It cannot be a set or an array of values.

5. Consistency: The primary key must remain consistent, which means it cannot change over time.

6. There can only be one primary key in a table. However, the primary key can consist of multiple columns, which is known as a composite key.

Which constraint must a primary key adhere to

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