Question: Consider the takes relation. Write an SQL query that computes a cross-tab that has a column for each of the years 2017 and 2018, and

Consider the takes relation. Write an SQL query that computes a cross-tab that has a column for each of the years 2017 and 2018, and a column for all, and one row for each course, as well as a row for all. Each cell in the table should contain the number of students who took the corresponding course in the corresponding year, with column all containing the aggregate across all years, and row all containing the aggregate across all courses.

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