Enterprise Digital Uplift and Systematic Technology Education

Course Content
Introduction to Database Management Systems
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Introduction
Features and Uses of Database Management Systems
DBMS Users and Applications
Database Design Fundamentals
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Problem Statement – Developing an Inventory Management System
Difference Between a Spreadsheet and a Relational Database
Requirement Analysis for Database Development
Entity-Relationship Diagram
Normalization
Selecting and Implementing DBMS
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Introduction to SQL
Selecting the Right Database Management System
Introduction to Database Management
About Lesson

Lesson 1: SQL Basics: Structured Query Language

Objectives

  • Understand the basic structure of SQL queries.
  • Learn how to retrieve data using SELECT statements.

Introduction

Having explored the critical process of selecting the right Database Management System (DBMS) for your project or organization, we now delve deeper into the realm of database management. In this lesson, we focus on the fundamental language used to interact with databases: Structured Query Language (SQL). Understanding SQL is essential for effectively managing and manipulating data within relational databases.

Basic SQL Commands and Syntax

SQL offers several basic commands for interacting with relational databases:

SELECT: Retrieves data from a database table based on specified criteria.

INSERT: Adds new records to a database table.

UPDATE: Modifies existing records in a database table.

DELETE: Removes records from a database table.

Additionally, SQL supports various clauses such as WHERE, ORDER BY, GROUP BY, and JOIN, which allow for more complex data retrieval and manipulation.

Executing SQL Queries

In this section, we provide an overview of executing SQL queries using popular relational database management systems (RDBMS). While we won’t perform actual database manipulation, understanding how to interact with databases through SQL queries is crucial for anyone working with data.

Connecting to a Database

Establishing a connection to the database is the first step in executing SQL queries. This involves specifying the database server, username, password, and other connection parameters. Once the connection is established, users can interact with the database by sending SQL queries.

Writing SQL Queries

SQL queries are written using a specific syntax defined by the SQL standard. The most common type of SQL query is the SELECT statement, which is used to retrieve data from one or more database tables. Queries can also include clauses such as WHERE, ORDER BY, GROUP BY, and JOIN to filter, sort, and group the data as needed.

Interpreting Query Results

After executing an SQL query, the database returns a result set containing the requested data. Users must interpret this result set to extract the information they need. Depending on the RDBMS used, the result set may be displayed in tabular format or formatted differently.

Summary

SQL, or Structured Query Language, is fundamental for interacting with relational databases.

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