Who is one is not unary operation in relational algebra?

Who is one is not unary operation in relational algebra? Correct Answer Union

Procedural query language - 4 Relational algebra ব্যবহৃত হয়। এটি বিভিন্ন ভাগে ভাগ করা যায়।
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Not until a student has mastered algebra —the principles of geometry, trigonometry and physics