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Relational Schema:

Employee (EmployeeID, FirstName, LastName, Email, Phone, HireDate, Salary, #DepartmentID)

Department (DepartmentID, DepartmentName, #ManagerID)

Project (ProjectID, ProjectName, StartDate, EndDate, Budget)

Employee_Project (#EmployeeID, #ProjectID, Role, AssignmentDate)

Explanation of Relationships:

  • Employee (EmployeeID) is the primary key.
  • Department (DepartmentID) is the primary key.
  • Project (ProjectID) is the primary key.
  • Employee_Project (#EmployeeID, #ProjectID) is a composite primary key (many-to-many relationship between Employee and Project).
  • Employee(#DepartmentID) REFERENCES Department(DepartmentID): An employee belongs to a department.
  • Department(#ManagerID) REFERENCES Employee(EmployeeID): A manager is an employee.
  • Employee_Project(#EmployeeID) REFERENCES Employee(EmployeeID)
  • Employee_Project(#ProjectID) REFERENCES Project(ProjectID)
QUESTION
Which query selects employees whose salary is greater than at least one employee in department 2?

A) SELECT * FROM Employee WHERE Salary > ANY (SELECT Salary FROM Employee WHERE DepartmentID = 2);

B) SELECT * FROM Employee WHERE Salary > (SELECT MAX(Salary) FROM Employee WHERE DepartmentID = 2);

C) SELECT * FROM Employee WHERE Salary = ALL (SELECT Salary FROM Employee WHERE DepartmentID = 2);

D) SELECT * FROM Employee WHERE Salary < (SELECT Salary FROM Employee WHERE DepartmentID = 2);

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Utilizarea parametrilor dinamici în rapoarte poate îmbunătăți performanța acestora.

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Ціна товару була підвищена на 25 %. Укажи, на скільки відсотків необхідно зменшити нову ціну товару, щоб одержати початкову

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When firms compete to supply homogeneous products and have similar cost structures, pure price competition drives firm profits down to zero. A firm can mitigate this outcome by
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Schéma relationnel :

  1. Employee (EmployeeID, FirstName, LastName, Email, Phone, HireDate, Salary, #DepartmentID)
  2. Department (DepartmentID, DepartmentName, #ManagerID)
  3. Project (ProjectID, ProjectName, StartDate, EndDate, Budget)
  4. Employee_Project (#EmployeeID, #ProjectID, Role, AssignmentDate)

Explication des relations :

  • Employee (EmployeeID) est la clé primaire.
  • Department (DepartmentID) est la clé primaire.
  • Project (ProjectID) est la clé primaire.
  • Employee_Project (#EmployeeID, #ProjectID) est une clé primaire composite (relation plusieurs-à-plusieurs entre Employee et Project).
  • Employee(#DepartmentID) → Department(DepartmentID) : Un employé appartient à un département.
  • Department(#ManagerID) → Employee(EmployeeID) : Un manager est un employé.
  • Employee_Project(#EmployeeID) → Employee(EmployeeID)
  • Employee_Project(#ProjectID) → Project(ProjectID)
QUESTION
Quelle requête affiche les employés qui ne sont pas dans le département 3 ou 5 ?

A) SELECT * FROM Employee WHERE DepartmentID NOT IN (3,5);

B) SELECT * FROM Employee WHERE DepartmentID != (3,5);

C) SELECT * FROM Employee WHERE DepartmentID <> (3,5);

D) SELECT * FROM Employee WHERE DepartmentID NOT ANY (3,5);

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Relational Schema:

Employee (EmployeeID, FirstName, LastName, Email, Phone, HireDate, Salary, #DepartmentID)

Department (DepartmentID, DepartmentName, #ManagerID)

Project (ProjectID, ProjectName, StartDate, EndDate, Budget)

Employee_Project (#EmployeeID, #ProjectID, Role, AssignmentDate)

Explanation of Relationships:

  • Employee (EmployeeID) is the primary key.
  • Department (DepartmentID) is the primary key.
  • Project (ProjectID) is the primary key.
  • Employee_Project (#EmployeeID, #ProjectID) is a composite primary key (many-to-many relationship between Employee and Project).
  • Employee(#DepartmentID) REFERENCES Department(DepartmentID): An employee belongs to a department.
  • Department(#ManagerID) REFERENCES Employee(EmployeeID): A manager is an employee.
  • Employee_Project(#EmployeeID) REFERENCES Employee(EmployeeID)
  • Employee_Project(#ProjectID) REFERENCES Project(ProjectID)
QUESTION
Which query displays departments with more than 5 employees?

A) SELECT DepartmentID FROM Employee WHERE COUNT(*) > 5;

B) SELECT DepartmentID, COUNT(*) FROM Employee GROUP BY DepartmentID HAVING COUNT(*) > 5;

C) SELECT DepartmentID, COUNT(*) FROM Employee HAVING COUNT(*) > 5;

D) SELECT DepartmentID FROM Employee GROUP BY DepartmentID;

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A 1992 Roper poll found that 22% of Americans say that the Holocaust may not have happened. The actual question asked in the poll was:

Does it seem possible or impossible to you that the Nazi extermination of the Jews never happened?

and 22% responded “Possible.” The results of this poll cannot be trusted because

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A questionnaire on a table at a shopping centre was completed by 100 shoppers.

The results were used to claim that the average amount of money spent by Australians increased from the previous year.

Which one of the following biases makes this survey questionable?

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