An n-way join performs consecutive n-1 joins among n tables. for each of the following 8-way joins, state how many join orders are possible and why (make sure to explain the reason). note ri ⋈ rj and rj ⋈ ri (switching around the order of two joined relations) are different join orders. in the join expressions below, ⋈ denotes an inner join, |⋈ denotes a left outer join, ⋈| denotes a right outer join, and |⋈| denotes a full outer join. hint: note commutativity of the different types of join operations.

a) r1 ⋈ r2 ⋈ r3 ⋈ r4 ⋈ r5 ⋈ r6 ⋈ r7 ⋈ r8

b) r1 ⋈ r2 ⋈ r3 |⋈ r4⋈ r5 ⋈ r6 ⋈ r7 ⋈ r8

c) r1 ⋈ r2 ⋈ r3 ⋈| r4⋈ r5 ⋈ r6 ⋈ r7 ⋈ r8

d) r1 ⋈ r2 ⋈ r3 |⋈| r4⋈ r5 ⋈ r6 ⋈ r7 ⋈ r8

Which requirement is an appropriate reason for a business to use it tools

Researchers measured the data speeds for a particular smartphone carrier at 50 airports. the highest speed measured was 78.1 mbps. the complete list of 50 data speeds has a mean of x overbarequals16.11 mbps and a standard deviation of sequals18.65 mbps. a. what is the difference between carrier's highest data speed and the mean of all 50 data speeds? b. how many standard deviations is that [the difference found in part (a)]? c. convert the carrier's highest data speed to a z score. d. if we consider data speeds that convert to z scores between minus2 and 2 to be neither significantly low nor significantly high, is the carrier's highest data speed significant? a. the difference is nothing mbps.

Ramona enjoys her job because she is able to kids in an after school program. the work value ramona feels strongest about is a. leadership b. risk c. independence d. work with people select the best answer from the choices provided a b c d