Test: Database Concepts - 2 - CUET Humanities MCQ

In computer's main memory, auxiliary storage and computer buses, data redundancy is the existence of data that is additional to the actual data and permits correction of errors in stored or transmitted data. The additional data can simply be a complete copy of the actual data, or only select pieces of data that allow detection of errors and reconstruction of lost or damaged data up to a certain level.

A database management system (DBMS) is system software for creating and managing databases. The DBMS provides users and programmers with a systematic way to create, retrieve, update and manage data. MS Access is a database management system.

MEPIS is a popular open source operating system. It aims at providing a Linux distribution that is very stable and very easy to use. So, this is the correct option.

Data redundancy is a condition created within a database or data storage technology in which the same piece of data is held in two separate places. This can mean two different fields within a single database, or two different spots in multiple software environments or platforms.

SQL is related to database.
SQL (Structured Query Language) is a query language used for accessing and modifying information in a database. The language was first created by IBM in 1975 and was called SEQUEL for Structured English Query Language. Since then, it has undergone a number of changes, many coming from Oracle products.

Make a full design by creating different tables which are interlinked with each other.

All of the above are constraints.

Data manipulation language is a type of SQL statement which is used to enter, modify or retrieve data from a table.

Domain, in a relational data model, is defined as a set of allowed values for one or more attributes in a relation.

Primary key column can never contain NULL values, therefore statement C is not allowed. Remaining statements are allowed to have NULL values. It is a correct answer.