Write a select statement that answers this question: which invoices have a paymenttotal that's greater than the median paymenttotal for all paid invoices? (the median marks the midpoint in a set of values; an equal number of values lie above and below it.) return the invoicenumber and invoicetotal for each invoice. hint: begin with the solution to exercise 2, then use the all keyword in the where clause and code "top 50 percent paymenttotal" in the subquery.

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

Which excel file extension stores automated steps for repetitive tasks?

Kenny works with an it company. his company is about to launch new software in the market. he has to ensure that this new software is functional and meets all of the quality standards set up at the planning stage. which job profile is kenny likely to have? kenny is likely to have the job profile of a blank .