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How to Learn SQL Query Writing?

If you are looking for a new challenge, you could consider learning how to write SQL queries. SQL is the “Structured Query Language”, which can be used to manipulate data within a relational database.

Though there are several SQL query books available on the market, it’s not necessary to spend that much money to learn SQL. There are plenty of places online that you can find free resources to help you out with SQL learning.

Here are a few of them:

Learn to Program: Build a Relational Database

This one is great for beginners because it teaches you the basics of SQL query writing and how to connect to a database. You will also learn about SQL commands and learn how to use them within a relational database. With this resource, you will be able to write your first SQL query and learn all the basic tricks of SQL.

Learn to Program: The SQL Language

This one is more appropriate for intermediate and advanced level learners because it teaches you the proper way of writing SQL queries. It also provides tips on how to best structure your queries so that they run faster and more efficiently. It is widely considered to be the best book on SQL queries if you are looking for expert opinions or just want to improve your own writing.

Learn SQL The Easy Way

This last one is great for absolute beginners or for those who never really studied computer programming. Though it is a bit outdated now, it still contains a lot of valuable information for those who are interested in learning SQL. The idea behind this particular book is to teach SQL through examples and exercises. By familiarizing yourself with SQL through these tactics, you will greatly ease your transition into the world of database administration.

Now that you’re feeling motivated to learn SQL query writing, where should you start? Let’s look at a few places where you can find free resources to help you out.

Learn to Program: The Big Nerd Ranch Guide to SQL

This is one of the more recommended websites when it comes to looking for tutorials, email tutorials, and quizzes on SQL. Though the website has had several updates over the years, it still contains quite a bit of value. They have also created a whole section that’s dedicated to explaining the basics of SQL, including syntax and data types. Also, you can use their website to practice your SQL queries. It provides you with a SQL interpreter so that you can enter your queries and have them executed. This is a great place to learn SQL as it allows you to experience the results of your changes immediately.

Official SQL Documentation

Though this documentation may not be free, it’s absolutely essential to have access to. When writing SQL queries, there are several ways in which they can fail. If you are running into problems, the documentation can help you find a solution. Documentation is also where you will find a detailed explanation of SQL’s various features and functions. It’s also a good idea to bookmark this documentation so that you can easily find answers when you need them.

Online SQL Tutorials

If you’re looking for guided learning, there are numerous websites that provide free SQL tutorials. Though these tutorials can be a bit tedious to follow along with, having them online is certainly beneficial. You can access them from any device with an internet connection. Also, most of these sites provide you with a certificate upon completion of the tutorial, making it highly relevant for job seekers.

Books About SQL

If you want to truly learn SQL, then it’s a must to invest in some good books. Though there are several on the market, here are a few of the most recommended ones.

  • SQL Query Writing – A Complete Guide To Syntax, Queries, And Performance Optimization
  • SQL in Plain English: An Introduction to SQL
  • T-SQL Programming: Building Applications with SQL Server
  • Pro SQL Server Database Design: Relational Design And Development

Don’t Forget About Audit Trails

If you work in an environment where security is a major concern, then it’s a good idea to learn how to write audit trails for your SQL queries. The basic idea behind an audit trail is to document all the changes that occur as a result of an SQL query. This way, you can easily track which changes were made by which users and when they were made. There are several different forms that audit trails can take, but usually they are in the form of a log, which can be accessed by both administrators and end users. Keep in mind that whenever you make any changes to a database, you have to document these changes in some way so that they can be undone in the case of a system failure. Writing an audit trail provides you with an additional layer of security and is highly recommended by experts and security professionals.

As you can see, there are many places where you can find free resources to help you learn SQL. Though there are several different ways in which you can approach your SQL education, it’s important to find the one that works best for you. Once you’ve decided what level you’re at, you can find the right tutor for you. Good luck out there.