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SQL -Structured Query Language- is a popular programming language widely used in managing and manipulating databases. In this blog, we share some expert tips for those seeking to learn SQL or brush up their skills. But first, it’s essential we understand SQL’s primary purpose.
What is SQL?
SQL primarily serves to communicate with databases. It is specifically designed to work with relational databases. Here is an example of a basic SQL query to select all data from a table:
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SELECT * FROM Employees; |
Best Practices for Learning SQL
1. Thorough Understanding of Basics
Most SQL codes are simply English statements and commands, making it relatively easy to master it. However, one needs to understand the basic syntax and parts of this language, such as queries and subqueries, SELECT, FROM, WHERE, GROUP BY, HAVING, among others. For instance, here’s how to use the WHERE clause to filter records based on specific criteria:
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SELECT * FROM Employees WHERE Salary > 50000; |
2. Practice Regularly
Learning SQL involves a lot of practice. Online platforms, tutorials, and challenges are beneficial in this respect. You could set your queries and work to achieve accurate results.
3. Work on Real Projects
Using SQL on real-life models can give you first-hand experience and exposure. You could create a simple database for your local library and manipulate it using SQL.
4. Take Advantage of Online Resources
The Internet is packed with many free resources and platforms that can help you learn SQL, such as interactive SQL tutorials, complex projects, and the online development community.
Things to Avoid When Learning SQL
As much as practices help, it’s also crucial to understand what to avoid:
1. Neglecting Theory
While practical application is fundamental, neglecting theory can lead to incomplete knowledge. Concepts such as Normalization and ACID properties are critical to understanding SQL.
2. Skipping Advanced Topics
Concepts like Joins, Stored Procedures etc., might look difficult at first, but they are essential for a well-rounded understanding, for instance how you can INNER JOIN two tables:
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SELECT Orders.OrderID, Customers.CustomerName FROM Orders INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID; |
3. Not Learning Related Technologies
SQL doesn’t exist in isolation. Complementary technologies, such as Python, R, JavaScript, can be beneficial in fetching, manipulating, and visualizing data from SQL databases.
Remember, learning SQL is not just about writing queries, but solving problems. With practice, right resources and determination, you’ll become proficient in no time.