Requirement engineering is the process of collecting, validating and managing the requirements essential for the development of the software, specified by the clients or the end-users. This task is performed at the initial stages of software development. The requirement engineering process involves a team of software developers or engineers, business analysts, customers and … [Read more...] about Requirement Engineering
Entity Relationship Diagram (ERD)
Entity relationship diagram is the graphical representation associated with the entity relationship model. ER diagram helps in representing the logical structure of the overall database. It represents the relationship between the entity sets stored in the database. The ER diagram illustrate the concepts in a way that is easy for many users to understand how the information … [Read more...] about Entity Relationship Diagram (ERD)
Relational Algebra in DBMS
Relational algebra is query language based on the set theory of mathematics. It is procedural as it defines the sequence in which the query must be operated to retrieve the result. Relational algebra has some basic fundamental operators along with some derived operators. In this section, we will discuss the definition of relational algebra. We will study each operator along … [Read more...] about Relational Algebra in DBMS
Transactions in DBMS
Transactions in SQL is a set of SQL statements that must be executed all at once or none of them must be executed. Transaction does not allow partial execution. The concept of transaction help in maintaining the integrity of the data in both the case even if there are multiple operations that are interrelated or there are multiple database users that update the database … [Read more...] about Transactions in DBMS
Join Operations in SQL
Join operations in SQL integrates two relations from the database to form a new relation. The relations are integrated or merged based on the common columns present in the two relations. In the section ahead, we will be discussing all forms of join in SQL. Types of Join Operations in SQL Natural Join Equi Join Theta Join Semi Join Outer Join Natural … [Read more...] about Join Operations in SQL