Building blocks of a Data Model Last Updated : 25 Mar, 2020 Comments Improve Suggest changes Like Article Like Report A data model is a structure of the data that contains all the required details of the data like the name of the data, size of the data, relationship with other data and constraints that are applied on the data. It is a communication tool. A data model is essential in order to store the database in a sorted manner. It will provide the interaction between the system analyst, designer and application programmer. It improves the understanding of designing of the database in which the organization is interested. A data model constitutes of building blocks. They are: 1. Entities 2. Attributes 3. Relationships 4. Constraints These are explained as following below in brief. Entities: Entities are real time objects that exist.It can be a person, place, object, event, concept. Entities are represented by a rectangle box containing the entity name in it. Example: Student, employee. Attributes: It is the set of characteristics representing an entity.It is represented by a ellipse symbol with attribute name on it. Example: A student has attributes like name, roll number, age and much more. Relationship: It describes the association between two entities.It is represented using diamond symbol containing relationship name with it.The data model generally uses three kinds of relationships:one to many, many to many, one to one. Example: The relationship between two entities Student and Class has many to many relationship. Constraints: Constraints are conditions applied on the data.It provides the data integrity. Example: A student can take a maximum of 2 books from the library is applied as a constraint on the student database. Comment More infoAdvertise with us Next Article Building blocks of a Data Model M mangalgiaishwarya2 Follow Improve Article Tags : DBMS Similar Reads SQL Interview Questions Are you preparing for a SQL interview? SQL is a standard database language used for accessing and manipulating data in databases. It stands for Structured Query Language and was developed by IBM in the 1970's, SQL allows us to create, read, update, and delete data with simple yet effective commands. 15+ min read Introduction of ER Model The Entity-Relationship Model (ER Model) is a conceptual model for designing a databases. This model represents the logical structure of a database, including entities, their attributes and relationships between them. Entity: An objects that is stored as data such as Student, Course or Company.Attri 10 min read DBMS Tutorial – Learn Database Management System Database Management System (DBMS) is a software used to manage data from a database. A database is a structured collection of data that is stored in an electronic device. The data can be text, video, image or any other format.A relational database stores data in the form of tables and a NoSQL databa 7 min read SQL Joins (Inner, Left, Right and Full Join) SQL joins are fundamental tools for combining data from multiple tables in relational databases. Joins allow efficient data retrieval, which is essential for generating meaningful observations and solving complex business queries. Understanding SQL join types, such as INNER JOIN, LEFT JOIN, RIGHT JO 6 min read Normal Forms in DBMS In the world of database management, Normal Forms are important for ensuring that data is structured logically, reducing redundancy, and maintaining data integrity. When working with databases, especially relational databases, it is critical to follow normalization techniques that help to eliminate 7 min read ACID Properties in DBMS In the world of DBMS, transactions are fundamental operations that allow us to modify and retrieve data. However, to ensure the integrity of a database, it is important that these transactions are executed in a way that maintains consistency, correctness, and reliability. This is where the ACID prop 8 min read Introduction of DBMS (Database Management System) A Database Management System (DBMS) is a software solution designed to efficiently manage, organize, and retrieve data in a structured manner. It serves as a critical component in modern computing, enabling organizations to store, manipulate, and secure their data effectively. From small application 8 min read SQL Query Interview Questions SQL or Structured Query Language, is the standard language for managing and manipulating relational databases such as MySQL, Oracle, and PostgreSQL. It serves as a powerful tool for efficiently handling data whether retrieving specific data points, performing complex analysis, or modifying database 15 min read CTE in SQL In SQL, a Common Table Expression (CTE) is an essential tool for simplifying complex queries and making them more readable. By defining temporary result sets that can be referenced multiple times, a CTE in SQL allows developers to break down complicated logic into manageable parts. CTEs help with hi 6 min read DBMS Architecture 1-level, 2-Level, 3-Level A database stores important information that needs to be accessed quickly and securely. Choosing the right DBMS architecture is essential for organizing, managing, and maintaining the data efficiently. It defines how users interact with the database to read, write, or update information. The schema 7 min read Like