If you want to practice SQL for interviews, a great way is to download a database management system like MySQL or PostgreSQL onto your personal computer. With these systems, you can create your own databases and tables to mimic those you might encounter during an interview. Once you have created a database, you can start writing SQL queries to practice extracting information from it.
There are many resources online that can help you learn SQL. In addition to the documentation for your chosen database management system, there are tutorials and articles that can teach you the basics of SQL syntax and help you understand how to structure your queries. Once you have a good understanding of the basics, you can start practicing more complex queries.
One way to practice complex queries is to findInterview Questions online that ask for specific information from a database. For each question, try to write a query that would extract the requested information. Then, compare your query to the correct answer to see where you made mistakes and how you can improve.
Another way to practice complex queries is to use data from a real-world situation that you are interested in. For example, if you are a baseball fan, you can download a database of baseball statistics and write SQL queries to answer questions like "Which players had the most home runs in a season?" or "What was the average batting average for all players in a particular year?"
By practicing SQL on your personal computer, you can become more comfortable with the syntax and the structure of queries, which will help you during interviews.