Question

define primary key how does a primary key help in organising a database
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Answer 1

Answer:

The purpose of the primary key in a database is to provide a map of the data.

A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records

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Answer 2

The purpose of the primary key in a database is to provide a map of the data.
A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records. A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null values.
The main purpose of a primary key is to implement a relationship between two tables in a relational database; it's not called a relational database for nothing! More specifically, the primary key is the "target" which a foreign key can reference.
A primary key is used to ensure data in the specific column is unique. You can only set constraints with primary keys, by setting a foreign key to another column which creates a relationship with the column that has the primary key set. A prime use of a primary key is in the case of a users table.





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