Question

■What is primary key and what are its advantage creating primary key ?please tell in short
■explain the different elements of a database with example in short
who will tell the answer 1st or in short way i will mark him/her ans brainlist ​

Answer 1

Answer:

Primary key

In the relational model of databases, a primary key is a specific choice of a minimal set of attributes that uniquely specify a tuple in a relation.

Advantage of primary key

1.Using the primary key, you can easily identify and find unique rows in the database table.

2.They allow you to update/delete only specific records by uniquely identifying them

The Elements of a Database

The Elements of a DatabaseThe database schema.

The Elements of a DatabaseThe database schema.Schema objects.

The Elements of a DatabaseThe database schema.Schema objects.Indexes.

The Elements of a DatabaseThe database schema.Schema objects.Indexes.Tables.

The Elements of a DatabaseThe database schema.Schema objects.Indexes.Tables.Fields and columns.

The Elements of a DatabaseThe database schema.Schema objects.Indexes.Tables.Fields and columns.Records and rows.

The Elements of a DatabaseThe database schema.Schema objects.Indexes.Tables.Fields and columns.Records and rows.Keys.

The Elements of a DatabaseThe database schema.Schema objects.Indexes.Tables.Fields and columns.Records and rows.Keys.Relationships

Answer 2

Answer:

hi good morning please answer me