Pandas SQL Query: Display the ID for those employees who did two or more jobs in the past
Pandas HR database Queries: Exercise-21 with Solution
Write a Pandas program to display the ID for those employees who did two or more jobs in the past.
JOB_HISTORY.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(result.filter(lambda x: len(x) > 1).groupby('employee_id').size().sort_values(ascending=False))
Sample Output:
employee_id 200 2 176 2 101 2 dtype: int64
Equivalent SQL Syntax:
SELECT employee_id FROM job_history GROUP BY employee_id HAVING COUNT(*) >=2;
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 first name, job id, salary and department for those employees not working in the departments 50,30 and 80.
Next: Write a Pandas program to calculate minimum, maximum and mean salary from employees file.
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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