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BCNF is like the next level of organization for database tables. It's better than 3NF because it removes even more redundancy and weird relationships between data, making the database more efficient and easier to manage.
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BCNF is considered to be an improved 3NF because in 3NF we can have fds where a non key derives a key attribute however that is not the case with BCNF, we can for sure say that all LHS of fds will be key attributes.
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