Relational Algebra The part of mathematics in which letters and other general symbols are used to represent numbers and quantities in formula and equations. Ex: (x + y) · z = (x · z) + (y · z). The main application of relational algebra is providing a theoretical...
Components of the Database System Environment There are five major components in the database system environment and their interrelationships are. Hardware Software Data Users Procedures Hardware: The hardware is the actual computer system used for keeping and...
Subject : SQL How to find salary of friends whose salary is Second highest; Table Name: friends friendsName salary Nihar 30000 Bihar 40000 Saiyar 50000 Nahar 55000 Query : SELECT friendsName,MAX(salary) as salary FROM friends WHERE salary < (SELECT...
SQLite database SQLite database engine implements a small, fast, self-contained, high-reliability, full-featured, . SQLite is one the most used database engine and is a C-language library. It is built into all mobile phones and most computers. The main package is...
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