Question: Compare the cost of two different query plans for the following query: salary > 40000 select (EMPLOYEE |X| DNO=DNUMBER DEPARTMENT) Use the database statistics in

Compare the cost of two different query plans for the following query: salary > 40000 select (EMPLOYEE |X| DNO=DNUMBER DEPARTMENT) Use the database statistics in Figure 15.8

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One plan might be for the following query tree We can use the salary index on EMPLOYEE for the select operation The table in Figure 188a indicates tha... View full answer

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