Problems 4-6 are based on the following query: SELECT EMP_LNAME, EMP_FNAME, EMP_DOB, YEAR(EMP_DOB) AS YEAR FROM EMPLOYEE WHERE YEAR(EMP_DOB) = 1976; 4. What is the likely data sparsity of the EMP_DOB column? 5. Should you create an index on EMP_DOB? Why or why not? 6. What type of database I/O operations will likely be used by the query? (See Table 11.3.)
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