Project: Analyzing Students' Mental Health in SQL

Does going to university in a different country affect your mental health? A Japanese international university surveyed its students in 2018 and published a study the following year that was approved by several ethical and regulatory boards.

The study found that international students have a higher risk of mental health difficulties than the general population, and that social connectedness (belonging to a social group) and acculturative stress (stress associated with joining a new culture) are predictive of depression.

Explore the students data using PostgreSQL to find out if you would come to a similar conclusion for international students and see if the length of stay is a contributing factor.

Here is a data description of the columns you may find helpful.

Field Name	Description
`inter_dom`	Types of students (international or domestic)
`japanese_cate`	Japanese language proficiency
`english_cate`	English language proficiency
`academic`	Current academic level (undergraduate or graduate)
`age`	Current age of student
`stay`	Current length of stay in years
`todep`	Total score of depression (PHQ-9 test)
`tosc`	Total score of social connectedness (SCS test)
`toas`	Total score of acculturative stress (ASISS test)

DataFrameas

students

variable

-- Run this code to save the CSV file as students
SELECT * 
FROM 'students.csv';

DataFrameas

df

variable

-- Start coding here...
SELECT COUNT(*) AS total_records
FROM
	students;

DataFrameas

df

variable

SELECT inter_dom,
	COUNT(*) AS count_student_type
FROM
	students
GROUP BY
	inter_dom;

DataFrameas

df

variable

SELECT inter_dom
FROM 
	students
WHERE 
	inter_dom IN ('Inter', 'Dom') OR inter_dom IS NULL;

DataFrameas

df

variable

SELECT ROUND(MAX(todep),2) AS max_depression,
	ROUND(MIN(todep),2) AS min_depression_test,
	ROUND(AVG(todep),2) AS avg_depression_test,
	ROUND(MAX(tosc),2) AS max_scs_test,
	ROUND(MIN(tosc),2) AS min_scs_test,
	ROUND(AVG(tosc),2) AS avg_scs_test,
	ROUND(MAX(toas),2) AS max_acc_stress_test,
	ROUND(MIN(toas),2) AS min_acc_stress_test,
	ROUND(AVG(toas),2) AS avg_acc_stress_test
FROM
	students;

DataFrameas

df

variable

SELECT ROUND(MAX(todep),2) AS max_depression,
	ROUND(MIN(todep),2) AS min_depression_test,
	ROUND(AVG(todep),2) AS avg_depression_test,
	ROUND(MAX(tosc),2) AS max_scs_test,
	ROUND(MIN(tosc),2) AS min_scs_test,
	ROUND(AVG(tosc),2) AS avg_scs_test,
	ROUND(MAX(toas),2) AS max_acc_stress_test,
	ROUND(MIN(toas),2) AS min_acc_stress_test,
	ROUND(AVG(toas),2) AS avg_acc_stress_test
FROM
	students
WHERE
	inter_dom IN ('Inter')
GROUP BY
	inter_dom;

DataFrameas

df

variable

SELECT stay,
	ROUND(AVG(todep),2) AS average_phq,
	ROUND(AVG(tosc),2) AS average_scs,
	ROUND(AVG(toas),2) AS average_as
FROM
	students
WHERE
	inter_dom = 'Inter'
GROUP BY
	stay
ORDER BY
	stay DESC;