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1) Calculate the cost of the three strategies cited in Example 23

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1) Calculate the cost of the three strategies cited in Example 23.1 if the Staff relation has 10 000 tuples, Branch has 500 tuples, there are 500 Managers (one for each branch), and there are 10 London branches.

2) Generate Relational Algebra Trees (R.A.T) as described in the Analysis Phase of Query Decomposition for Pblm. 23.17 (a) - (c), pg. 733.