Answer:
I belive the answer is primary key actully
Explanation:
B on edg 2021
Primary key refers to a value in a table that is a reference to the unique values in a corresponding table in a relational database.
Relational database refers to a group of tables that store associated data. Relational database tables have a few essential properties.
- Order of the columns or rows does not matter.
- Every row includes exactly one value per column.
- Value in each given column is of the same type.
A primary key refers to the group of columns or an individual column which helps in unique identification of every single row in a table. The primary key is used to identify each row of a table in the database and to define the relationship between the tables.
All tables in a relational database must have a primary key. No two rows in a table will have the same values for a primary key.
A table can contain unlimited of data. It can easily contain records which can be in thousands. Here is when the importance of primary key can be understood. To identify the data uniquely, without scrolling through the data, you will need a primary key.
If no primary key is specified, all columns become the same primary key. You should keep your primary key for each table as compact as possible.
The concept of a primary key is essential for an efficient relational database. Without a primary key and closely related foreign key concepts, a relational database wouldn't work.
Primary key plays a very important role in a relational database. It ensures row level accessibility for the data in database.
Hence, (B) Primary key is the correct answer.
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