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:
Python Code Editor:
Structure of 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’.
What is the difficulty level of this exercise?
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
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