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Data Modeling, Data Engineering and Data analysis with PostgreSQL

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sql-challenge

In this activity, a fictional company employee database was requested. That consisted of designing the tables (data modeling), importing the CSV data into a SQL database (data engineering), and then answering the following data analysis questions:

  1. List the employee number, last name, first name, sex, and salary of each employee.

  2. List the first name, last name, and hire date for the employees who were hired in 1986.

  3. List the manager of each department along with their department number, department name, employee number, last name, and first name.

  4. List the department number for each employee along with that employee’s employee number, last name, first name, and department name.

  5. List first name, last name, and sex of each employee whose first name is Hercules and whose last name begins with the letter B.

  6. List each employee in the Sales department, including their employee number, last name, and first name.

  7. List each employee in the Sales and Development departments, including their employee number, last name, first name, and department name.

  8. List the frequency counts, in descending order, of all the employee last names (that is, how many employees share each last name).

Data Modeling - ERD

Data Modeling - ERD