Pandas SQL Query: Display all the location id from locations file

Last update on May 28 2022 13:37:59 (UTC/GMT +8 hours)

Pandas HR database Queries: Exercise-2 with Solution

Write a Pandas program to display all the location id from locations file.

LOCATIONS.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 = locations[['location_id']]
print("All the locations id from locations file:")
print(result)

Sample Output:

All the locations id from locations file:
    location_id
0          1000
1          1100
2          1200
3          1300
4          1400
5          1500
6          1600
7          1700
8          1800
9          1900
10         2000
11         2100
12         2200
13         2300
14         2400
15         2500
16         2600
17         2700
18         2800
19         2900
20         3000
21         3100
22         3200

Equivalent SQL Syntax:

SELECT location_id  FROM LOCATIONS;

Click to view the table contain:

Python Code Editor:

Structure of HR database :

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Previous: Write a Pandas program to display all the records of REGIONS file.
Next: Write a Pandas program to extract first 7 records from employees file.

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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