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Structured Query Language (SQL) was developed to work with relational databases that organize and store information in groups of columns and rows, called tables. They are “relational” because of relations linking data between different tables (think: Excel). SQL has lasted for decades, and it’s become the industry standard because of its ease, versatility, and power in working with transactional data. SQL is easy to learn for beginners, and can take developers far in their careers....