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Relational Algebra: Notation

A Relational Algebra expression in traditional notation

Find the dates on which orders were placed for Runcible Spoons.

Π[order_date](σproduct_name = "Runcible Spoon"(Order ⨝ Product))


The same Relational Algebra expression in functional notation

My preference:
( ( (Order, Product) product_name = "Runcible Spoon"), ["order_date"])

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