Consider the bank database of Figure 15.14, where the primary keys are underlined. Suppose that a B+-tree index on branch city is available on relation branch, and that no other index is available....








Consider the bank database of Figure 15.14, where the primary keys are underlined.
Suppose that a B+-tree index on branch city is available on relation
branch, and that no other index is available. List different ways to handle the
following selections that involve negation:
a. σ¬(branch city<>
b. σ¬(branch city=“Brooklyn”)(branch)
c. σ¬(branch city<“brooklyn” ∨=""><>


Jun 09, 2022
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