What is the primary key in an entity?
Correct Answer: Unique identifier for each record
- Step 1: Understand what an entity is. An entity is a thing or object that can have data stored about it, like a person, car, or product.
- Step 2: Know that each entity can have many records. For example, a 'Person' entity can have records for John, Jane, and Bob.
- Step 3: Realize that each record needs to be unique so we can tell them apart. This is where the primary key comes in.
- Step 4: The primary key is a special piece of information that is unique for each record. For example, a person's ID number can be a primary key.
- Step 5: Remember that no two records can have the same primary key. This helps to avoid confusion and keeps the data organized.
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