Category: Basic

A comment is a piece of text that is used in programming languages to provide additional information. These comments are ignored by the compiler and do not affect the program’s functionality. They are not visible in the output after the execution of code. Their purpose is to make the source code easier for human to…

What is SQL Expression? An SQL expression is a combination of one or more values, operators and SQL functions that are all evaluated to a value. These SQL EXPRESSION(s) are like formulae and they are written in query language. You can also use them to query the database for a specific set of data. Expressions…

What is SQL Operator? An SQL operator is a reserved word or a character used primarily in an SQL statement’s WHERE clause to perform operation(s), such as comparisons and arithmetic operations. These Operators are used to specify conditions in an SQL statement and to serve as conjunctions for multiple conditions in a statement. An SQL…

What are SQL Data types? An SQL data type refers to the type of data which can be stored in a column of a database table. In a column, the user can store numeric, string, binary, etc by defining data types. For example integer data, character data, monetary data, date and time data, binary strings,…

What is SQL Syntax? SQL syntax is a unique set of rules and guidelines to be followed while writing SQL statements. This tutorial gives you a quick start with SQL by listing all the basic SQL Syntax. All the SQL statements start with any of the keywords like SELECT, INSERT, UPDATE, DELETE, ALTER, DROP, CREATE,…

SQL Databases SQL or Relational databases are used to store and manage the data objects that are related to one another, i.e. the process of handling data in a relational database is done based on a relational model. This relational model is an approach to manage data in a structured way (using tables). A system…

What is RDBMS? RDBMS stands for Relational Database Management System. RDBMS is the basis for SQL, and for all modern database systems like MS SQL Server, IBM DB2, Oracle, MySQL, and Microsoft Access. A Relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model as introduced by E. F. Codd in…

What is SQL? SQL (Structured Query Language) is a language to operate databases; it includes Database Creation, Database Deletion, Fetching Data Rows, Modifying & Deleting Data rows, etc. SQL stands for Structured Query Language which is a computer language for storing, manipulating and retrieving data stored in a relational database. SQL was developed in the 1970s by IBM…

This Roadmap will guide you to master SQL. You will learn core concepts, techniques, and best practices by following mentioned topics. This step-by-step path will help you as a beginner. What is a Tutorial Roadmap? Tutorial Roadmap typically covers the journey from beginner to advanced user, including key concepts, practical applications, and best practices. SQL…

Our SQL tutorial helps you learn SQL (Structured Query Language) in simple and easy steps so that you can start your database programming quickly. It covers most of the important concepts related to SQL for a basic to advanced understanding of SQL and to get a feel of how SQL works. SQL (Structured Query Language) is a…