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Nearly every app runs on a database. SQL books and database books are a solid investment for students and analysts. See computer science, and GATE books for exam practice.
Practise by writing real queries on small sample datasets. Joins, indexing and normalisation also come up again and again in technical interviews.
Technology moves quickly, so choose recent editions and practise on a real computer as you read. Strong basics in logic, data and problem solving will serve you well, however many new tools arrive over the years.
Students and working professionals alike gain from building small real projects. A working project teaches more than a finished chapter, and it also gives you something to show at placement time and in job interviews.