𝗛𝗼𝘄 𝘁𝗼 𝗹𝗲𝗮𝗿𝗻 𝗦𝗤𝗟?

Structured Query Language (SQL) is a domain-specific language used in programming and designed to manage data in relational database management systems. It has been used for many years now.

It was developed at IBM in the early 1970s. As relational databases remain very popular, the need to use them remains for any developer.

The SQL language has 𝗰𝗹𝗮𝘂𝘀𝗲𝘀, which are components of statements and queries; 𝗲𝘅𝗽𝗿𝗲𝘀𝘀𝗶𝗼𝗻𝘀, which can produce scalar values or tables; 𝗽𝗿𝗲𝗱𝗶𝗰𝗮𝘁𝗲𝘀, which specify conditions that can be evaluated under SQL three-valued logic; and 𝗾𝘂𝗲𝗿𝗶𝗲𝘀, which retrieve data based on criteria and other elements.

So, the question is 𝗵𝗼𝘄 𝘁𝗼 𝗹𝗲𝗮𝗿𝗻 𝗦𝗤𝗟. Here are some (free) resources that I can recommend:

𝟭. 𝗦𝗤𝗟𝗕𝗼𝗹𝘁 - is an entirely free, fully interactive introductory course. All SQL basics are covered, including writing queries, filtering, joins, aggregations, and table creation, update, and deletion.

𝟮. 𝗦𝗤𝗟𝗭𝗼𝗼 - It provides both tutorials and exercises, and that’s why it is equally helpful for someone just starting with SQL and programmers who know SQL but want some good practice to really master it.

𝟯. 𝗦𝗤𝗟 𝗧𝘂𝘁𝗼𝗿𝗶𝗮𝗹 𝗮𝘁 𝗙𝗿𝗲𝗲𝗖𝗼𝗱𝗲𝗖𝗮𝗺𝗽 - This SQL course has got more than 7 million views, and I think it's YouTube’s most popular free SQL course.

𝟰. 𝗣𝗼𝗽𝗦𝗤𝗟 - is actually an exciting tool for collaborative SQL querying. It enables multiple users to share queries, store commonly used queries in a searchable library, and provide a visual interface for analysis.

𝟱. 𝗟𝗲𝗮𝗿𝗻𝗶𝗻𝗴 𝗦𝗤𝗟 𝗯𝘆 𝗔𝗹𝗮𝗻 𝗕𝗲𝗮𝘂𝗹𝗶𝗲𝘂 𝗳𝗿𝗲𝗲 𝗯𝗼𝗼𝗸 - This book provides some helpful context regarding the language's history and current usage, offers an overview of query and table architecture, and covers some more complex SQL subjects than the courses mentioned above.

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