quescol Database languages are specialized programming languages that are used to communicate with and manipulate databases. There are two main categories of database languages: data definition languages (DDL) and data manipulation languages (DML). In other words, a database language is a programming language that is used to create, modify and maintain the structure and content of … Read more
Data independence is also called Data abstraction. In the 3-level architecture of D.B.M.S, we see the purpose of all three levels of architecture. In data independence, we discuss the use of these levels. Data independence is the concept of making data independent from the users. The basic aim of the user is to access data, … Read more
The objective of database schema is to recognize different tables and fields of each table. Schema also describes how the relationship is established between tables. This helps to identify constraints in the system. The subschema is a subset of the schema and the subschema inherits the same property as the schema. Schema can be divided … Read more
Ans: Three-level architecture in DBMS is a very important and hot topic. The three-level architecture shows the working and roles of different users at different levels of the database. How database architecture is divided into levels, and what things are going through at each level. The three-level architecture of the database system is as follows … Read more
The data model describes how the data are stored in the database and related to each other. It also gives a view that how the relationship is established between them. The data model also defines how the logical structure of the database is created. The data model organizes schema and stores the data in the … Read more
Category and shared subclass both are different terms. Their concepts are separate fields from each other. The category contains two or more superclasses which may represent different-different entity types, while other regular shared subclasses always have a single superclass. An entity that is a member of the shared subclass must exist in all superclasses, but … Read more
In a Database Management System (DBMS), “instance” and “schema” are two fundamental concepts that are as essential as the foundation and blueprint of a building. Let’s explore these concepts in a way that’s easy to understand. What is Instance? Storing data collection in a database at a particular moment in time is called an instance. … Read more
Data redundancy is a situation in which there are multiple copies of the same data stored at different places in the database. For example: When a customer came to a shop to buy something, and shop owner notes down the list of item every time and generate a bill for each product. Then this is … Read more
What is Database System? A Database System is a complex and sophisticated system designed to store, manage, and retrieve structured data efficiently. It provides a systematic and organized method of storing data in tables that consist of rows and columns. These systems allow for the definition of data types, relationships among different data items, constraints, … Read more
A file system is a traditional way for the collection of data and a system that is used to manage data in our system. When there is no word like “database management system (D.B.M.S)”, people use file management systems to store their data. In the file system, we face lots of issues such as searching, … Read more