Pandas SQL Query: Calculate minimum, maximum and mean salary from employees file

Last update on May 28 2022 13:04:50 (UTC/GMT +8 hours)

Pandas HR database Queries: Exercise-22 with Solution

Write a Pandas program to calculate minimum, maximum and mean salary from employees file.

EMPLOYEES.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")
result = job_history.groupby(['employee_id']) 

print(employees.agg({'salary': ['min', 'max', 'mean', 'median']}))

Sample Output:

              salary
min      2100.000000
max     24000.000000
mean     6461.682243
median   6200.000000

Equivalent SQL Syntax:

SELECT * 
	FROM jobs 
		ORDER BY job_title;

Click to view the table contain:

Python Code Editor:

Structure of HR database :

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Previous: Write a Pandas program to display the ID for those employees who did two or more jobs in the past.
Next: Write a Pandas program to display the details of jobs in descending sequence on job title.

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