Oracle SQL: From Beginning to Advance Level (2025)

Oracle Database Fundamentals: A Comprehensive Guide

Introduction to Oracle Database

Discover the power of Oracle Database, a leading relational database management system (RDBMS) renowned for its reliability, scalability, and advanced features. This guide provides a comprehensive introduction to Oracle Database, covering everything from its history and installation to core SQL concepts and advanced functionalities.

What is a Database?

Understand the fundamental concept of a database and its role in data management. Learn how databases organize, store, and retrieve information efficiently.

History of Oracle Database

Explore the evolution of Oracle Database, from its origins to its current state as a cornerstone of enterprise data management.

Installation of Oracle Database

Learn how to download and install Oracle Database 21c on your system. We provide step-by-step instructions for a smooth installation process.

SQL Developer: Your Development Tool

Download and setup SQL Developer, a powerful graphical tool for developing and managing Oracle databases. This guide covers logging on to the Oracle Database using SQL*Plus and introduces the features of SQL Developer for efficient SQL development.

Setting Up Your Test Environment

Create a functional test environment to practice and apply the concepts learned throughout this course.

SQL Fundamentals in Oracle Database

Introduction to SQL and Creating Tables

Begin your journey into SQL (Structured Query Language), the standard language for interacting with databases. Learn how to create tables in Oracle Database using the CREATE statement.

SQL Statement Types

Understand the different types of SQL statements:

• DQL (Data Query Language): Used to retrieve data.
• DML (Data Manipulation Language): Used to manipulate data (insert, update, delete).
• DDL (Data Definition Language): Used to define the database structure (create, alter, drop).
• DCL (Data Control Language): Used to control access to data (grant, revoke).
• TCL (Transaction Control Language): Used to manage transactions (commit, rollback).

Data Types in Oracle Database

Explore the various data types supported by Oracle Database, including numbers, strings, dates, and more.

Retrieving Data with SELECT

Master the SELECT statement to retrieve data from tables. Learn how to display all columns or specific columns from a table. Introduction to dummy tables for practice.

Operators in Oracle Database

Learn about different operators used in Oracle Database:

• Arithmetic Operators: Perform mathematical calculations.
• Relational Operators: Compare values (e.g., =, >, <).
• Logical Operators: Combine conditions (e.g., AND, OR, NOT).
• Special Operators: (e.g., IN, BETWEEN, IS NULL).

DDL Commands

Dive into DDL commands for defining and modifying database objects.

Creating Tables with CREATE

Use the CREATE statement to create tables in Oracle Database.

Displaying Table Structure

Use DESCRIBE in SQL*Plus and SQL Developer to view the structure of a table.

Altering Tables

Learn how to modify tables using DDL commands:

• Adding new columns.
• Modifying column data types.
• Renaming columns.
• Deleting columns.
• Renaming tables.
• Dropping tables.

Table Recovery

Understand the recyclebin and Flashback features for recovering dropped tables.

DML Statements: Data Manipulation

Inserting Data

Use the INSERT statement to insert data into tables.

Updating Data

Use the UPDATE statement to update data in tables, either specific records or the entire table.

Deleting Data

Use the DELETE statement to delete data from tables, either single records or the entire table. Understand the difference between DELETE and TRUNCATE statements.

Merge Statement

Learn how to use the MERGE statement for complex data manipulation tasks.

SQL Operators: A Deeper Dive

Explore SQL operators in detail, including:

• Dual Table: Understand the purpose and usage of the DUAL table.
• Arithmetic Operators: Perform calculations.
• Comparison Operators: Compare values.
• Logical Operators: Combine conditions.
• NULL Values: Understand how to handle NULL values.
• Special Operators: IN, NOT IN, BETWEEN, NOT BETWEEN, IS NULL, IS NOT NULL, LIKE, NOT LIKE, ANY, ALL.

Joins: Retrieving Data from Multiple Tables