What Is the Precise Definition of a Primary Key

question 30

Essay

What is the precise definition of a primary key?

---

Definitions:

Petiole

The stalk attaching the leaf blade to the stem in plants, providing support and transporting nutrients and water.

Stem

The main structural part of a plant that supports leaves, flowers, or fruits and transports fluids between different parts of the plant.

Bud Scale

A modified leaf that covers and protects a dormant bud.

Epidermis

The outermost layer of cells covering an organism, notably the skin of animals or the surface layer of plants.