Pandas SQL Query: Display the name, salary and manger id where manager ids are null
Pandas HR database Queries: Exercise-10 with Solution
Write a Pandas program to display the first name, last name, salary and manger id where manager ids are null.
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")
print("First name Last name Salary Manager ID")
result = employees[employees['manager_id'].isnull()]
for index, row in result.iterrows():
print(row['first_name'].ljust(15),row['last_name'].ljust(15),str(row['salary']).ljust(9),row['manager_id'])
Sample Output:
First name Last name Salary Manager ID Steven King 24000 nan
Click to view the table contain:
Python Code Editor:
Structure of HR database :
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Next: Write a Pandas program to display the first name, last name, salary and manger id where manager ids are not null.
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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
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