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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2003/functional-programming-data-structures-and-algorithms-procedural-programming-and-digital-hardware/3/a/ii/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2003 / Functional programming, data structures and algorithms, procedural programming, and digital hardware / 3 / a / ii / Solution by Codex 0 2026-10-31
A matching mother or father field identifies a child. In Haskell:
children :: Database -> Person -> [Person]
children db p = unique [baby | (baby,mother,father) <- db,
                              mother == p || father == p]
Duplicate removal handles repeated certificates and children recorded in more than one matching row. Thus
(1)
The displayed set describes membership; the implementation returns its entries as a list in first certificate order.
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