Symbols for Relational Algebra Expressions and Other Symbols Symbols for relation schemas: R, S, T Symbols for relations: R, S, T, ∅ Symbols for Relational Algebra operators: ∪, -, π, σ, ρ, ⨯, ∩, Δ, ÷, ⨝, ⟗, ⟕, ⟖, ⋉, ⋊, ▷ Symbols for logical connectives: ∧, ∨, ¬ Symbols for comparison predicates: , =, ≤, ≥, ≠ Symbols for set-theoretical operations: ∈, ∉, ⊆, ⊂, ⊇, ⊃ Other mathematical symbols: ⊥, ⋅, ∃, ∀, ∘, ←, → All names (for example, for relations and attributes) should be written in normal font (no italics) to increase readability. All symbols should be surrounded by blanks to increase readability. Database schema Animals(AnimalID, Species, Name, DateOfBirth, Gender, HabitatID, Origin, ArrivalDate, DietType)Habitats(HabitatID, Type, Size, Location, CleaningSchedule, EnvironmentControlSettings)ZooStaff(StaffID, FirstName, LastName, Role, Department, HireDate, Qualifications, ContactNumber)AnimalHealthCare(StaffID, AnimalID, CareDate, Treatment, Notes)VisitorTours(TourID, Date, Time, GuideStaffID, RouteDescription, Theme, Duration, GroupSize)Maintenance(MaintenanceID, HabitatID, Description, Year, Date, StaffID, Status, Priority)ConservationPrograms(ProgramID, Name, Description, StartDate, EndDate, ResponsibleStaffID)ZooEvents(EventID, Name, Date, Time, Location, OrganizerStaffID, TargetAudience, Budget) Query Find the names of events that have the largest budgets in the “Amazon area” (location name and unique).

Part 1:  Entity-Relationship Model [40 points] Design an Entity-Relationship diagram with ERDPlus by considering the requirements listed in the statements below. That means that you have to identify suitable entity sets, relationship sets, attributes, keys of entity sets, and so on. Further, add the cardinalities (1:1, 1:m, m:1, m:n) to the relationship sets. Write down your thoughts and assumptions regarding the cardinalities if there could be a doubt. It is up to you if you choose Chen’s notation or Crow’s foot notation. But you have to use the selected notation consistently, that is, you should not mix the two notations. As we all have found out, ERDPlus does not cleanly support both notations. In both notations, ERDPlus uses rectangles for entity sets, double rectangles for weak entity sets, diamonds for relationship sets, double diamonds for identifying relationship sets, ovals for attributes, double ovals for multiple attributes, trees for composite attributes, and trees for generalizations. The only difference that ERDPlus provides to distinguish both notations refers to cardinalities. In Chen’s notation, one has to use the labels 1, n, and m for cardinalities (with the known overlapping problem). Double lines are not provided so it is impossible to represent total participation as well as the double line between an identifying relationship set and a weak entity set. You should then describe this in a sentence below the ER diagram. In crow’s foot notation, ERDPlus offers the little bar, the little oval, and the crow’s foot to indicate cardinalities. The instructor’s recommendation is to use the ERDPlus version of Crow’s foot notation since it provides all the functionality that you need.

Consider the two ER diagrams below. The first ER diagram models a ternary relationship set R between the entity sets E1, E2, and E3. The second ER diagram includes the same entity sets E1, E2, and E3 but uses binary relationship sets R1, R2, and R3 between each pair of entity sets. Discuss if both ER diagrams have the same expressiveness, that is, if they always represent the same information.

Symbols for Relational Algebra Expressions and Other Symbols Symbols for relation schemas: R, S, T Symbols for relations: R, S, T, ∅ Symbols for Relational Algebra operators: ∪, -, π, σ, ρ, ⨯, ∩, Δ, ÷, ⨝, ⟗, ⟕, ⟖, ⋉, ⋊, ▷ Symbols for logical connectives: ∧, ∨, ¬ Symbols for comparison predicates: , =, ≤, ≥, ≠ Symbols for set-theoretical operations: ∈, ∉, ⊆, ⊂, ⊇, ⊃ Other mathematical symbols: ⊥, ⋅, ∃, ∀, ∘, ←, → All names (for example, for relations and attributes) should be written in normal font (no italics) to increase readability. All symbols should be surrounded by blanks to increase readability. Database schema Animals(AnimalID, Species, Name, DateOfBirth, Gender, HabitatID, Origin, ArrivalDate, DietType)Habitats(HabitatID, Type, Size, Location, CleaningSchedule, EnvironmentControlSettings)ZooStaff(StaffID, FirstName, LastName, Role, Department, HireDate, Qualifications, ContactNumber)AnimalHealthCare(StaffID, AnimalID, CareDate, Treatment, Notes)VisitorTours(TourID, Date, Time, GuideStaffID, RouteDescription, Theme, Duration, GroupSize)Maintenance(MaintenanceID, HabitatID, Description, Year, Date, StaffID, Status, Priority)ConservationPrograms(ProgramID, Name, Description, StartDate, EndDate, ResponsibleStaffID)ZooEvents(EventID, Name, Date, Time, Location, OrganizerStaffID, TargetAudience, Budget) Query Identify the names and species of animals that have received healthcare from more than one staff member.

Design an ER diagram for the following requirements of an online streaming service system. The streaming service is identified by a unique name and provides different subscription plans. Each subscription plan has a unique plan ID, including details such as name and price as well as features such as the number of screens and HD availability. Subscribers, with unique subscriber IDs, include personal information such as name, email, and payment details, and are enrolled in one subscription plan. Movies on the platform have unique movie IDs and details such as title, description, release year, and duration. Each movie is linked to a director with a director ID, including the director’s name and biography. The platform tracks the genres associated with each movie. Movies are categorized into various genres, each with a name and a description, and a movie can be associated with multiple genres. Subscribers have a viewing history, with each record identified by a history ID, including the date and time of viewing. Subscribers can rate and review movies, with each rating identified by a rating ID and including rating value and review. Directors can direct multiple movies, but each movie is directed by only one director. Create your diagram using ERDPlus. Provide additional explanations if necessary. When you are finished, export it as an image, and upload it.

Ventral (Anterior) roots of the spinal nerves carry

Use Figure 12-1 to answer the following questions:Where are the somatic motor neurons found? Figure 12-1 The Spinal Cord Use Figure 12-1 to answer the following questions:Where do somatic motor neurons reside?

What is the epineurium?

Use Figure 12-1 to answer the following questions:What is the function of the structure labeled “14”? Figure 12-1 The Spinal Cord Use Figure 12-1 to answer the following questions:What is the function of the structure labeled “14”?

In the spinal cord, the central canal carries