Answer:
Explanation:
Duplicate tuples are not allowed in a relation because the specifications of the constraints of the regional integrity are violated, especially the main constraint that states that there can be no identical values for the attributes of two tuples at any database relation state.
Also, duplicate tuples are not allowed in a relation due to the fact that they lead to redundancy of the data base which in turn, slowing down the speed of the database when data processing such as inserting, querying, updating, deleting, etc are being performed.
Before starting an inboard gasoline engine, you should
remove the engine cover completely to let the engine air out. Next is to change
the fuel filter or the water separator. Marine fuel filters and water
separators help draw water from the boat fuel, therefore protecting the motor
from the water. If water were to get in, it could cause serious problems.
You should also consider changing the engine oil. This is
especially so if the motor boat has been sitting around for a while. The fourth
step is to change the oil filter. It is recommended that the oil filter is
changed every 100 hours or every season. Other steps include;
Recharge the battery.
Refuel your boat.
Check the cooling system.
Hi!
It depends on how close you have paraphrased it. If your "common knowledge" is very closely related to the resource, it would be considered plagiarism.
