Knowledge Factory

A relational database refers to a database that stores data in a structured format, utilizing rows and columns. This makes it facile to locate and access concrete values within the database. It is "relational" because the values within each table are cognate to each other. Tables may withal be cognate to other tables. The relational structure makes it possible to run queries across multiple tables at once. Today, we will see a  list of top Relational databases. MySql MySQL is the most popular Open Source Relational SQL Database Management System. MySQL is one of the best RDBMS being used for developing various web-based software applications.MySQL runs on virtually all platforms, including Linux, UNIX, and Windows. Although it can be used in a wide range of applications, MySQL is most often associated with web applications and online publishing. https://www.mysql.com/ PostgreSQL PostgreSQL is an advanced, enterprise-class open-source relational database that fortifies both SQ

Hello everyone, today we will learn list of SQL query commands. SQL is a domain-concrete language used in programming and designed for managing data held in a relational database management system, or for stream processing in a relational data stream management system. Commands ALTER TABLE ALTER TABLE is used to add, efface/drop or modify columns in the existing table. It is withal used to integrate and drop various constraints on the existing table. ALTER TABLE table_name ADD column_name datatype; AND The AND operator displays a record if all the conditions separated by AND are TRUE. SELECT column1, column2, ... FROM table_name WHERE condition1 AND condition2 AND condition3 ....; AS The AS command is used to rename a column or table with an alias. SELECT UserID AS ID, UserName AS User FROM Users; AVG() SQL Server AVG() function is an aggregate function that returns the average value of a group. SELECT AVG(Salary) AS AvgSalary FROM Employee; BETWEEN The SQL BETWEEN cond