Mastering SQL SELECT Clauses: A Practical Guide for Beginners When working with relational databases, the SELECT statement is the most frequently used SQL command. It allows you to retrieve data from tables and analyze it according to your needs. But in real-world scenarios, simply selecting… Read More
Data Manipulation Language (DML) in SQL Introduction In modern information systems, data plays a crucial role in decision-making, automation, and business operations. Almost every application—banking systems, hospital management software, e-commerce platforms, social media applications, and educational portals—relies on databases to store and manage data efficiently.… Read More
Introduction to SQL Commands (DDL, DML,DQL, DCL, TCL) Beginner-Friendly Professional Documentation 1. SQL Basics & Command Categories What is SQL? SQL (Structured Query Language) is a standard language used to manage and interact with databases. Databases store data in the form of tables (rows and… Read More
Data Retrieval language(DRL) Data Retrieval Language (DRL) is a part of SQL used to retrieve (fetch) data from a database without modifying it. Main Command: SELECT – used to get data from one or more tables. Examples:
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SELECT * FROM students; → Retrieves all records from the students table. SELECT name, marks FROM students WHERE marks > 60; → Retrieves names and marks of students who scored more than 60. |
Purpose: ● To view data ● To… Read More
Data Definition Language (DDL) Introduction Structured Query Language (SQL) is the standard language used for interacting with relational databases. SQL is divided into different categories based on the type of operations performed on the database. Among these categories, Data Definition Language (DDL) plays a foundational… Read More
Introduction to SQL What is SQL? SQL (Structured Query Language) is a database computer language used to communicate with and retrieve data from relational databases. It allows users to store, manipulate, update, and retrieve data efficiently. SQL is widely used with popular database systems such… Read More
Dear Readers, In this article, we will see the SQL Joins. Joins A join is a query that combines rows from two or more tables Join Conditions Most join queries contain WHERE clause conditions that compare two columns, each from a different table. Such a… Read More
Dear Readers, In this article we will focus on new feature that has been introduced in Oracle 18C that is “Private Temporary Table”. Private temporary tables are temporary database objects that are dropped at the end of end of a session or transaction depending on… Read More
Dear Readers, In this article we will focus one of the most remarkable feature that has been introduced in Oracle 18C that is “now you can cancel SQL statement without killing session”. Prior 18C, DBA’s had to kill a DB sessions to get rid of… Read More
ORACLE ANALYTICAL FUNCTIONS – 1 In this article, we will see how Analytical functions works in Oracle. Analytical Function : Analytical function is used to compute the aggregate values and perform aggregate operations it returns more than value in each group In sql we have… Read More
