Found 2 Questions For RDBMS

What is Primary Key in SQL ?

Updated on 14-Dec-2021 17:04:38
Primary Key is a constraint in SQL. So, before understanding what exactly is a primary key, let’s understand what exactly is a constraint in SQL. Constraints are the rules enforced on data columns on a table. These are used to limit the type of data that can go into a table. Constraints can either be column level or table level. Let’s look at the different types of constraints which are present in SQL: Constraint Description NOT NULL Ensures that a column cannot have a NUL... Read More

What is SQL server ?

Updated on 14-Dec-2021 16:57:09
To understand what exactly is SQL Server, we need to understand what is DBMS and RDBMS. DBMS stands for Database Management System. When we have a huge database with us, we would need a proper management system which would help us organise this database.  There are 4 types of database management systems: Hierarchical Network Relational Object-Oriented. Out of these database management systems, SQL Server comes under the category of Relational database management system.  A re... Read More