Answer A B and C : Exercise 7.2.5: Write the following as tuple-based CHECK constraints about our “battleships” schema: Classes (class, type, country, numGuns, bore,
Answer A B and C : Exercise 7.2.5: Write the following as tuple-based CHECK constraints about
our “battleships” schema:
Classes (class, type, country, numGuns, bore, displacement)
Ships (name, class, launched)
Battles (name, date)
Outcomes (ship, battle, result)
a) No class of ships may have guns with larger than a 16-inch bore.
b) If a class of ships has more than 9 guns, then their bore must be no larger
than 14 inches.
! c) No ship can be in battle before it is launched.
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