Computers and Technology, 12.12.2019 03:31 evanwall91
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 β rj and rj β ri (switching around the order of two joined relations) are different join orders. in the join expressions below, β denotes an inner join, |β denotes a left outer join, β| denotes a right outer join, and |β| denotes a full outer join. hint: note commutativity of the different types of join operations.
a) r1 β r2 β r3 β r4 β r5 β r6 β r7 β r8
b) r1 β r2 β r3 |β r4β r5 β r6 β r7 β r8
c) r1 β r2 β r3 β| r4β r5 β r6 β r7 β r8
d) r1 β r2 β r3 |β| r4β r5 β r6 β r7 β r8
Answers: 3
Computers and Technology, 21.06.2019 22:00
What must you do before formatting a paragraph?
Answers: 1
Computers and Technology, 22.06.2019 03:20
Which of these is a benefit of social networking? oa. hiding your true identity from friendsob. avoiding talking to people in personoc. spending time with friends instead of studyingod. connecting with new people
Answers: 2
Computers and Technology, 23.06.2019 10:00
How do i delete my account on this because i didn't read this agreements and also i put age at xd
Answers: 1
Computers and Technology, 23.06.2019 22:30
The output voltage of a power supply is assumed to be normally distributed. sixteen observations are taken at random on voltage are as follows: 10.35, 9.30, 10.00, 9.96, 11.65, 12.00, 11.25, 9.58, 11.54, 9.95, 10.28, 8.37, 10.44, 9.25, 9.38, and 10.85
Answers: 1
An n-way join performs consecutive n-1 joins among n tables. for each of the following 8-way joins,...
History, 11.03.2020 04:46