Question: to write algebra expression, you need to use rename, assignment and cartesian product. In addition, you need to use extended relational algebra operators, groupby and

to write algebra expression, you need to use rename, assignment and

to write algebra expression, you need to use rename, assignment and cartesian product. In addition, you need to use extended relational algebra operators, groupby and aggregate.

cartesian product. In addition, you need to use extended relational algebra operators,

Part 2. Translation between sql statement, relation algebra and expression: We use the following database schema: Sailors (sid, sname, rating, age) Reserves (sid, bid, date) Boats (bid, bname, color) 4. Write the sql statement and relation algebra for: Find those ratings for which the average age is the minimum over all ratings

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