complex-sql-tool 1.0.4

A toy tool for IDS706 to run complex SQL with external MYSQL database.

IDS706_complex_sql_hx84

Overview

You can find this tool here

Objective

Implement an ETL (Extract, Transform, Load) process for the Adult dataset, split it into multiple relational tables, and perform complex SQL queries involving joins, aggregations, and sorting.

Tasks

• Extract: Download the Adult dataset.
• Transform & Load: Clean the data, split it into multiple tables, and load it into a AWS based MySQL database.
• Queries: Write complex SQL queries involving joins, aggregations, and sorting.

Structure

.
├── img
│   ├── database.png
│   └── test.png
├── LICENSE
├── Makefile
├── mylib
│   ├── extract.py
│   ├── __init__.py
│   ├── main.py
│   ├── query.py
│   └── transform_load.py
├── README.md
├── requirements.txt
├── sql
│   ├── create_tables.sql
│   ├── query1.sql
│   └── query2.sql
└── test_main.py

Installation

To install the Complex SQL Tool, use pip:

pip install complex_sql_tool

Usage

After installing, you can use the tool with the following command:

complex_sql_tool --help

Examples

complex_sql_tool extract
complex_sql_tool load
complex_sql_tool query

SQL query

Create Table

• Defines three tables: personal_info, employment_info, and income_info.
• Each table has an id column as the primary key with AUTO_INCREMENT.
• The tables store different aspects of the data for normalization.

DROP TABLE IF EXISTS personal_info;
DROP TABLE IF EXISTS employment_info;
DROP TABLE IF EXISTS income_info;

CREATE TABLE personal_info (
    id INT AUTO_INCREMENT PRIMARY KEY,
    age INT,
    sex VARCHAR(10),
    race VARCHAR(50),
    native_country VARCHAR(50),
    marital_status VARCHAR(50),
    relationship VARCHAR(50)
);

CREATE TABLE employment_info (
    id INT AUTO_INCREMENT PRIMARY KEY,
    workclass VARCHAR(50),
    occupation VARCHAR(50),
    education VARCHAR(50),
    education_num INT,
    hours_per_week INT,
    capital_gain INT,
    capital_loss INT,
    fnlwgt INT
);

CREATE TABLE income_info (
    id INT AUTO_INCREMENT PRIMARY KEY,
    income VARCHAR(20)
);

Query1

• For each sex and education level (with more than 50 individuals), calculate the average age and average hours per week, sorted by average hours per week in descending order.

SELECT
    p.sex,
    e.education,
    AVG(p.age) AS average_age,
    AVG(e.hours_per_week) AS average_hours_per_week,
    COUNT(*) AS count
FROM
    personal_info p
JOIN
    employment_info e ON p.id = e.id
GROUP BY
    p.sex, e.education
HAVING
    COUNT(*) > 50
ORDER BY
    average_hours_per_week DESC;

Query2

• For each native country (with more than 50 individuals), calculate the number of people, number of high-income individuals, and the percentage of high-income individuals, sorted by high-income percentage in descending order.

SELECT
    p.native_country,
    COUNT(*) AS total_people,
    SUM(CASE WHEN i.income = '>50K' THEN 1 ELSE 0 END) AS high_income_people,
    ROUND(SUM(CASE WHEN i.income = '>50K' THEN 1 ELSE 0 END) / COUNT(*) * 100, 2) AS high_income_percentage
FROM
    personal_info p
JOIN
    income_info i ON p.id = i.id
GROUP BY
    p.native_country
HAVING
    COUNT(*) > 50
ORDER BY
    high_income_percentage DESC;

Results

Database in MYSQL

Query Results

query1

sex	education	average_age	average_hours_per_week	count
Male	Prof-school	45.6116	47.9256	484
Female	Doctorate	45.3256	47.3023	86
Male	Doctorate	48.3272	46.8869	327
Male	Masters	44.4903	45.0657	1187
Female	Prof-school	40.1957	44.7935	92
Male	Bachelors	40.3217	44.0375	3736
Male	Assoc-voc	38.9399	43.7540	882
Male	Assoc-acdm	38.0464	42.5542	646
Male	HS-grad	39.1157	42.4814	7111
Male	Some-college	37.0174	41.5284	4485
Female	Masters	43.0746	41.1138	536
Male	1st-4th	45.2459	40.6230	122
Male	7th-8th	48.0350	40.4095	486
Male	5th-6th	42.3855	39.8594	249
Male	9th	40.6432	39.6514	370
Male	10th	38.3464	39.3370	638
Female	Bachelors	35.6356	39.3292	1619
Female	Assoc-voc	37.8720	37.8300	500
Male	12th	33.1176	37.7682	289
Female	Assoc-acdm	36.3610	37.3587	421
Female	HS-grad	38.6782	36.5773	3390
Male	11th	33.4078	36.3122	743
Female	7th-8th	49.6938	36.2000	160
Female	5th-6th	44.3690	36.0476	84
Female	Some-college	33.7406	34.5748	2806
Female	9th	42.1319	33.9167	144
Female	10th	35.4475	32.1119	295
Female	12th	29.7569	31.7917	144
Female	11th	30.5463	29.8218	432

---

query2

native_country	total_people	high_income_people	high_income_percentage
India	100	40	40.00
Taiwan	51	20	39.22
Japan	62	24	38.71
Italy	73	25	34.25
England	90	30	33.33
Canada	121	39	32.23
Germany	137	44	32.12
Philippines	198	61	30.81
China	75	20	26.67
Cuba	95	25	26.32
Total	583	146	25.04
United-States	29170	7171	24.58
South	80	16	20.00
Poland	60	12	20.00
Jamaica	81	10	12.35
Puerto-Rico	114	12	10.53
El-Salvador	106	9	8.49
Vietnam	67	5	7.46
Mexico	643	33	5.13
Guatemala	64	3	4.69
Columbia	59	2	3.39
Dominican-Republic	70	2	2.86

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Test