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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
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An n-way join performs consecutive n-1 joins among n tables. for each of the following 8-way joins,...
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