For an instructor lead, in-depth look at learning SQL click below.
If you’re looking to build a career in data, then learning SQL is a must. Structured Query Language or SQL is the language that enables you to interact with databases. Regardless of whether you’re a data analyst, a data scientist, or a business analyst, having a basic understanding of SQL is vital for your data career.
Features of a Good SQL Courses for Beginners
A good SQL course for beginners should consist of various features that include:
- An Introduction to SQL and its practical applications.
- Understanding of databases and the basics of database management systems (DBMS).
- Introduction to Tables, Schemas, and Views.
- Data Manipulation Language (DML) basics including CRUD operations (Create, Read, Update and Delete).
- Data Query Language (DQL) basics.
- Database relationships and Keys understanding.
SQL Code Examples
Here are few simple SQL code examples:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 |
-- To create a table CREATE TABLE Employees ( EmployeeID int, FirstName varchar(255), LastName varchar(255), Email varchar(255), Age int ); -- To insert data into 'Employees' INSERT INTO Employees (EmployeeID, FirstName, LastName, Email, Age) VALUES (1, 'John', 'Doe', <a href="mailto:'john.doe@email.com'" >'john.doe@email.com'</a>, 30); -- To select all data from 'Employees' SELECT * FROM Employees; -- To update the 'Age' of 'John Doe' UPDATE Employees SET Age = 31 WHERE FirstName = 'John' AND LastName = 'Doe'; -- To delete 'John Doe' from 'Employees' DELETE FROM Employees WHERE FirstName = 'John' and LastName = 'Doe'; |
Conclusion
Choosing the right SQL course can be the difference between struggling to understand complex databases or being a pro at sorting them. Remember, learning SQL is a start, not an end. Data is ever-evolving, so should your skills!