37. __________ was the first commercially successful graphical user interface.
a. Windows
b. The Apple Macintosh
c. MS-DOS
d. UNIX
b. The Apple Macintosh
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The Java library that supports database connectivity is called:
a. ODBC b. CDBC c. MDBC d. JDBC
A cell that contains a comment is marked with a blue triangle
Indicate whether the statement is true or false
Answer the following queries using relational algebra:
Consider the following relational schema, where the keys are underlined:
Employee ( ssn, name, gender, address, salary, supervisorSSN, dnumber )
Department ( dnumber, dmname, managerSSN)
DeptLocation ( dnumber, dlocation)
Project (pnumber, pname, plocation)
WorksOn (emplSSN, pnumber, hours)
(a) Retrieve the names of all male employees in department number 666, who work more
than 13 hours per week on project "Catch 22".
(b) Find the names of employees who are two managerial levels below the employee "Joe
Public".
(c) Find names of the department that have no employees.
(d) Find those employees in department number 123 who do not work on any project at
location NYC.
A Windows domain is the same as a DNS domain.
Answer the following statement true (T) or false (F)