Question

What will be returned when the following SQL statement is executed?Select empSSN, count(*) as num_projecsFrom tblWorksOnGroup By empSSN;

Select one:
a. A list of each employees as well as a number of projects that he or she has joined
b. None of the others
c. A list of all employees, sorted by empSSN
d. A count of all of the projects by all employees

Answer 1

The SQL statement will return a list of each employee's Social Security Number along with a count of the number of projects they are involved in, grouped by their Social Security Number.

Step-by-step explanation:

When the following SQL statement is executed:

Select empSSN, count(*) as num_projecs
From tblWorksOn
Group By empSSN;

It will return a list where each row contains an employee's Social Security Number (empSSN) and the count of projects that the employee is associated with in the tblWorksOn table. This is achieved by grouping the data by empSSN and counting the number of rows for each unique empSSN, which represents the number of projects an employee is working on.

Hence, the correct answer to this question is:

a. A list of each employee's Social Security Number as well as a number of projects that he or she has joined

This result provides a concise summary of the employee involvement in different projects, which can be useful for management and HR purposes.