Question: (c) [4 marks] Suppose that a data warehouse for Company consists of the following three dimensions: product (P), location (L), and time (T), and

(c) [4 marks] Suppose that a data warehouse for Company consists of the following three dimensions: product (P), location (L), and time (T), and one measure sales. Below is a lattice of all possible cuboids created on the data warehouse. Each of the numbers shows the cost of using the corresponding cuboid when it is materialized to answer a group-by query. Assume that all the queries are issued with the same frequency, and we have already materialized two cuboids {PLT} and {LT}. Which cuboid will be materialized next using the greedy algorithm and why? PL 5000 P 1500 PLT 10000 PT 8000 L 300 1 LT 1000 T 800

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