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Pandas SQL Query: Display the name, and department number for all employees whose last name is "McEwen"

Pandas HR database Queries: Exercise-5 with Solution

Write a Pandas program to display the first and last name, and department number for all employees whose last name is "McEwen".

EMPLOYEES.csv

DEPARTMENTS.csv

Sample Solution :

Python Code :

import pandas as pd
employees = pd.read_csv(r"EMPLOYEES.csv")
departments = pd.read_csv(r"DEPARTMENTS.csv")
job_history = pd.read_csv(r"JOB_HISTORY.csv")
jobs = pd.read_csv(r"JOBS.csv")
countries = pd.read_csv(r"COUNTRIES.csv")
regions = pd.read_csv(r"REGIONS.csv")
locations = pd.read_csv(r"LOCATIONS.csv")
print("Last name  First name    Department ID")
result = employees[employees.last_name == 'McEwen']
for index, row in result.iterrows():	
    print(row['last_name'],'   ',row['first_name'],'       ',row['department_id'])

Sample Output:

Last name  First name    Department ID
McEwen     Allan         80.0

Equivalent SQL Syntax:

SELECT first_name, last_name, department_id
 FROM employees
  WHERE last_name = 'McEwen';

Click to view the table contain:

Employees Table

Departments Table

Countries Table

Job_History Table

Jobs Table

Locations Table

Regions Table

Python Code Editor:


Structure of HR database :

HR database

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Previous: Write a Pandas program to select distinct department id from employees file.
Next: Write a Pandas program to display the first, last name, salary and department number for those employees whose first name starts with the letter ‘S’.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m