In today’s technology-driven world, there is a reason why data is considered as the new oil. It allows different organizations ranging from startups to industry giants, to more effectively learn the user behavior, determine the cause of problems, develop new strategies, etc.
SQL (Structured Query Language) is required to create, access, update, and delete the data. So, the knowledge of SQL is one of the most sought after and valuable skills that the employers demand.
In this article, I have compiled some of the most useful SQL resources that I recommend to everybody who wants to learn SQL. Based on how much time you'll be able to invest and how much deeper you want to learn and master SQL, I have segregated the resources into different segments. So, let's begin.
Its content is very concise and straight-forward. Along with the resources they also provide the option to run SQL queries on their platform with a few dummy tables made for the hands-on. If you have no prior experience of SQL then you can start with W3 School.
It covers SQL commands and theories exhaustively and its USP is, along with all the tutorials, it provides quizzes and exercises to test your understanding after every tutorial. SQL Zoo has divided the whole curriculum into different well-defined stages like Select basics, Aggregate functions, Joins, DDL Commands, etc.
If you wish to quickly prepare SQL questions asked in interviews, you can refer to the above site. It starts with basic SQL queries and then moves into more complex SQL questions asked in interviews, indirectly covering the different SQL commands and concepts. From basic interview questions on Select and where clause to SQL queries for finding duplicate rows, displaying odd/even rows only, it covers them all.
As we know that Stanford University is one of the world's biggest research and teaching universities. Additionally, it provides free online classes, among them being a multiple mini-courses for learning different elements of the SQL Server. The courses contain videos, quizzes, and exercises.
Khan Academy provides well-explained tutorials on each and every SQL concepts. If you are someone who likes studying from audio-video mediums then Khan Academy is just the right resource for you. The training course content starts with the basics of SQL and then they proceed to more complex topics.
It is a complete 4 hours and 20 minutes video on SQL tutorial. The video course is designed for beginners to learn the fundamentals of SQL and database management systems. It covers topics including schema design, basic C.R.U.D surgeries, aggregation, constraints, nested queries, joins, etc..
SQL The Complete Reference, by James Groff, Paul Weinberg, and Andy Oppel covers each and every aspect of SQL along with advanced-level topics like - database security, database performance optimization, backup, DBMS transactions, locking mechanisms, materialized views, etc.
This completes our list of SQL resources that one can refer to both learning SQL as well as preparing for their SQL interviews. I hope this post gave you enough actionable resources to get started on your SQL journey.
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