For an instructor lead, in-depth look at learning SQL click below.
With an ever-increasing demand for real-time, interactive, and dynamic websites, SQL (Structured Query Language) proficiency has become crucial for server-side scripting. In this post, I will share some great SQL courses that can shape you into an efficient web developer. But first, let’s have a glimpse of a simple SQL code snippet.
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SELECT * FROM Customers; |
This code simply extracts all data from the ‘Customers’ table in your database.
1. Learn SQL from Codecademy
Codecademy offers a dedicated course for SQL, where you get to learn about queries, aggregate functions, multiple tables and much more. They also provide ample examples and challenges to master the clauses and statements of SQL.
Now let’s see an example of a WHERE clause that is typically used to filter records. The following SQL statement selects all fields from “Customers” where the “Country” is “Mexico”:
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SELECT * FROM Customers WHERE Country ='Mexico'; |
2. Khan Academy’s SQL Course
Khan Academy is a well-known educational platform. It offers courses on SQL focusing on data manipulation, querying complex data, and data cleaning. Interactive exercises aid in understanding the advanced concepts of SQL.
Let’s assume you have an ‘Orders’ table and you want to get the sum of the ‘Quantity’ in all orders from the ‘Customers’ whose country is ‘Mexico’. You can achieve it using the SUM() function and the JOIN clause. Here’s the SQL code for that:
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SELECT SUM(Orders.Quantity) AS 'Total Quantity' FROM Orders JOIN Customers ON Orders.CustomerID = Customers.CustomerID WHERE Customers.Country = 'Mexico'; |
3. Coursera’s SQL for Data Science
Coursera’s SQL for Data Science is a top-rated SQL course designed by the University of California. The course offers a deep insight into the fundamentals of SQL, designed for beginners and advanced learners alike.
Consider a situation where you want to join data from two tables, ‘Orders’ and ‘Customers’, and get all the Mexican customers who have placed an order. Below is an example of how to code that using SQL:
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SELECT Customers.CustomerName FROM Orders INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID WHERE Customers.Country = 'Mexico'; |
These are just a few examples of powerful courses that could provide you with a proficient understanding of SQL for dynamic web-based applications. As always, practice is the key when it comes to mastering SQL, so do invest your time wisely!
Conclusion
As data-centric applications continue to dominate the web, the need to analyse, manipulate, and manage data using SQL is not merely an optional skill anymore, but a necessity. The courses mentioned above will provide you with excellent guidance and support in your journey of mastering SQL, opening doors to a plethora of opportunities in web development.