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Which of the below statements regarding the cell wall are true?

In calculating airfreight rates, airlines figure the dim weight of the shipment based on the volume yielding a certain weight value. As a result, 

Please refer to the provided Relations diagram. Which of the following statements about null values is/are true according to the relational model ?

Please refer to the provided Relations diagram. Which of the following relational algebra queries return a single tuple with the value of {5}?

Please refer to the provided Relations diagram. Suppose we do the left outer join of Customer and Order, where Customer is the left operand and Order is the right operand. Which of the following is/are true?

Please refer to the provided Relations diagram. Consider the query:

Please use the diagram below for the questions that follow it.  (You may click on the image or link to open it in a new tab/window.) Exam2-EER.png

Please refer to the provided Relations diagram. How many tuples will be returned by the following relational algebra query?

Please refer to the provided Relations diagram. If we do a right outer join between OrderDetail (on left) and Item (on right) , OrderDetail ⟖ Item, the number of tuples in the result is

A                                 B                               C                             D                                          E