Sqlserver Interview questions

Total available count: 45
Subject - Databases
Subsubject - Sqlserver

What is a Primary key?

  • The primary key constraint uniquely identifies each record in a database table
  • Every table should have a primary key constraint to uniquely identify each row and only one primary key constraint can be created for each table
  • Primary keys must contain unique values
  • A primary key column cannot contain NULL values
    empid int NOT NULL PRIMARY KEY,
    empname varchar(255) NOT NULL,
    age varchar(255),
    address varchar(255),
    city varchar(255)