SQL Training: Onsite and Online

Whether you're looking for customized in-person SQL training for a private group or a public online SQL class you can join, Webucator has the solution for you.

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5-min Narrated Presentation on SQL

  • History of SQL
  • Purpose of SQL
  • SQL: Difficulty Level
  • SQL: The Good
  • SQL: The Future
  • SQL Syntax

History of SQL

  • SQL (Structured Query Language) was developed by IBM in the late 1970s for IBM's DB2 RDBMS
  • SQL became the language for relational database development
  • ANSI formalized SQL as a standard in 1986
  • SQL is vital to developing databases in major platforms such as Oracle, MySQL and Microsoft SQL Server

SQL Is Three Languages

  • SQL is actually three languages!
  • Data Definition Language (DDL) for the creation, alteration and dropping of database objects (e.g., tables)
  • Data Manipulation Language (DML) for querying and updating relational data
  • Data Control Language (DCL) for securing data

Sample Uses of SQL

  • Interactive through GUI interfaces such as Microsoft Access query grids
  • Embedded in GUI and console business applications
  • Embedded in Java EE and Microsoft .NET web applications

SQL Difficulty Level

  • SQL is a high-level data access language
  • SQL was designed to be written by end users and developers
  • SQL is not a programming language
  • Commonly used in programming courses

Learning SQL

  • SQL is relatively straightforward to learn
  • Design query grids such as offered by Microsoft Access expedite learning SQL
  • Excellent documentation is available from all major vendors such as MySQL: https://dev.mysql.com/doc/refman/5.7/en/
  • SQL lexicon consists of understandable commands such as SELECT, INSERT, UPDATE and DELETE

SQL: The Good

  • Relatively straightforward to learn
  • Cross-platform
  • Excellent documentation from major vendors (e.g., Oracle, IBM, Microsoft)
  • Well respected in the IT industry

SQL: The Bad

  • SQL is a computer language and may present challenges to students with no computer language background.

SQL: The Future

  • SQL has a bright future!
  • Both ANSI and ISO publish standards for SQL usage
  • Tremendous corporate investment in SQL-based applications
  • Full support by major vendors such as Oracle, Microsoft and IBM

Syntax

  • Syntax was originally established by IBM based on the company's PL/I programming language
  • The language keywords are not case sensitive although capitalization is standard practice
  • The syntax is based on easily-understandable verbs:
    • SELECT
    • INSERT
    • UPDATE
    • DELETE

Creating a Table

CREATE TABLE GardenTools
(
id			INT NOT NULL,
description	VARCHAR(1000),
price			NUMERIC (9,2))

Comments

--Single-line comments follow 2 hyphens

/*
This is a 
	multi-line comment.
*/

Strings

  • Fixed-length strings are defined as char:
    • Customer_name CHAR(25) DEFAULT 'BestCo Ltd.'
  • Varying-length strings are defined as varchar:
    • Address_line VARCHAR(100) DEFAULT '2017 Anywhere Lane'

Integer, Decimal, and Float Column Types

  • quantity_on_hand INT DEFAULT 0
  • item_price DECIMAL(9,2)
  • population_of_asia FLOAT

Date and Time Column Types

  • date_of_order DATE
  • time_of_order TIME

Selecting Data from a Table

  • SELECT * FROM GardenTools
  • SELECT id, description FROM GardenTools WHERE price > 9.99

Inserting a Row into a Table

  • INSERT INTO GardenTools VALUES (202, 'Large rake', 24.49)
  • INSERT INTO GardenTools (id, description) VALUES (219, 'Small rake')

Updating a Row in a Table

  • UPDATE GardenTools
  • SET price = 25.99
  • WHERE id = 202

Deleting a Row in a Table

  • DELETE FROM GardenTools WHERE id = 202

Keep Learning SQL

by taking a

Webucator SQL class

https://www.webucator.com/database-training/sql-training.cfm

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9.47

Students rated our SQL trainers 9.47 out of 10 based on 322 reviews

The instructor was great at explaining not only how to do something but also what not to do.

Maria Stiller, AIG Chartis
Bronx NY

Really enjoyed the class... from the comfort of my office. The instructor was confident and knowledgeable. Would recommend Webucator to anyone.

Rob Naquin, Kirby Corporation
Houston TX

Being from the UK I was worried about pacing and translation. However, the tutor was excellent and I really took a lot away from it!

Shaun Tead, Chartered Developments t/a Smart Trade Ltd
Exeter

This was a very well paced class. The instructor had a wealth of knowledge and she did a great job!

Lisa Dunn, OpenTV
San Francisco CA

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