Pandas SQL Query: Extract first 7 records from employees file
Pandas HR database Queries: Exercise-3 with Solution
Write a Pandas program to extract first 7 records 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")
print("First 7 records from employees file:")
print(employees.head(7))
Sample Output:
First 7 records from employees file: employ_id first_name ... manager_id department_id 0 100 Steven ... NaN 90.0 1 101 Neena ... 100.0 90.0 2 102 Lex ... 100.0 90.0 3 103 Alexander ... 102.0 60.0 4 104 Bruce ... 103.0 60.0 5 105 David ... 103.0 60.0 6 106 Valli ... 103.0 60.0 [7 rows x 11 columns]
Equivalent SQL Syntax:
SELECT * FROM EMPLOYEES limit 7;
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 location id from locations file.
Next: Write a Pandas program to select distinct department id 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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