Question: 2. Suppose we have a relation with schema R(A, B, C, D, E) If we issue a query of the form SELECT ??? FROM R

2. Suppose we have a relation with schema R(A, B, C, D, E) If we issue a query of the form SELECT ??? FROM R WHERE ... GROUP BY C, D What terms can appear in the SELECT list (represented by ??? in the above query)? Identify, in the list below, the term that CAN NOT appear. O a) COUNT(*) o b b) COUNT(A) Oc) E O A d) AVG(A)
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