SQL Fundamentals

Basic computer skills.

This SQL training course is for people who want to gain the necessary skills to extract and analyse data from any database and create reports. Course members will learn:

• how to write SQL queries
• what relational databases are and how we can use them
• what are relations and how to create them
• the structure of data
• differences between SQL dialects (Oracle, T-SQL, ANSI)
• practical skills for writing queries

This SQL course deals with generic ANSI SQL. It can be used in any database, including Oracle, MySQL, Microsoft Access, Microsoft SQL Server, DB2, Informix, PostgreSQL any other relational databases.

RDBMS (Relational DataBase Management System)

Relational Operators

SQL as Declarative Language

SQL Syntax

SQL Sublanguages DQL, DML, DDL, DCL

DQL (Data Query Language) in Detail

• SELECT clause
• Column aliases
• Table aliases
• Date types and Date functions
• Group function
• Table joins
• JOIN clause
• UNION operator
• Nested queries
• Correlated subqueries

DML (Data Manipulation Language) Overview

• Inserting rows (INSERT)
• Inserting rows using subquery
• Updating rows (UPDATE)
• Deleting rows (DELETE)

DDL (Data Definition Language) Overview

• Creating, altering and dropping objects (CREATE, ALTER, DROP)
• Creating tables using subquery (CREATE TABLE .... AS SELECT...)

CONSTRAINTS Overview

• NULL i NOT NULL
• CONSTRAINT clause
• ENUM type
• SET type
• PRIMARY KEY
• UNIQUE
• FOREIGN KEY
• DEFAULT clause

Transactions Overview

• COMMIT
• ROLLBACK
• SAVEPOINT
• Implicit and explicit rollbacks and commits

SQL Dialects Overview

• MySQL
• Microsoft Access and SQL Server
• Oracle and PostgreSQL