(Homework Solution): The following queries refer to the Dog Food Recommendation Database from Homework #1,

( Relational Algebra )

I need answers for 5,6,7,8

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The following queries refer to the Dog Food Recommendation Database from Homework #1, The tables from the answer to Homework #1 are repeated on Page 2. 3. Find all dogs that weigh over 100 pounds. The answer will have columns, Dog Name, Dog Gender, 4. Find all foods manufactured by the preferred manufacturer of “Paula Thompson”(CName) The correct 5. Retrieve all dogs that are above the max weight for any of their breeds. The correct answer will have 6. Determine the manufacturers that are NOT the preferred manufacturer of anyone. The correct answer 7. Find all customers who have a “Border Collie” (Breed Name) The correct answer will have columns C 8. Find the tallest breed. HINT: the max height for a male is aways greater than the max height of a and Dog Weight. e columns Food Name and Package Weight. columns Dog Name, Dog Gender, and Dog Weight will have columns Manufacturer Name and M Phone# Name, C Email, Dog Name, and Dog Gender female. The correct answer will have columns Breed Name

Expert Answer

answers

5- select Dog_Name, Dog_Gender, max(Dog_Weight)

From Dog d, Is_Of i

Where d.CID=i.CID

Group by Breed_Name,dog_name,dog_gender,dog_weight;

6-select manufacturer_name, M_Phone#

From Manufacturer m,food f,Customer c,tried t

Where m.Manufacturer_name=f.manufacturer_name and f.food_name=t.food_name and t.cid=c.cid and Prefers_Manufacturer_name is null;

7-select C_name, c_Email,Dog_name,Dog_Gender

From customer c , dog d ,Breed b,is_of i

Where b.breed_name=’Border Collie’ and c.cid=d.cid and b.breed_name=i.breed_name and i.cid=c.cid;

8-select Breed_name

From breed

Group by breed_name

Having max(male_max_height);

Comments For each bit:

5- select dog_name,gender,height from table dog and put a equi join condition to join two tables and grouped them as breed_name,dog,name,gender,weight of the dog

6-select name of the manufacturer and phn no from manufacturer table and put a equi join to join tables and put a condition that prefer manufacturer is null so that we can find who don’t have preferred manufacturer.

7-select name email,dog name, gender from dog and customer table and put a where condition with equi join condition

8-select breed name from breed grouped them as breed name which is having maximum height from male.

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