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';

-- Start coding here...

SELECT COUNT(*) -- corrected
FROM students;

SELECT COUNT(inter_dom) -- corrected
FROM students
WHERE inter_dom = 'Inter';

SELECT COUNT(inter_dom) -- corrected
FROM students
WHERE inter_dom = 'Dom';

SELECT * 
FROM students 
WHERE inter_dom = 'Inter';

SELECT *
FROM students
WHERE inter_dom = 'Dom';


SELECT * 
FROM (
SELECT   5, inter_dom as "Student", todep as "Depression", tosc as "Social Connectedness", toas as "Acculturative Stress" -- corrected
FROM students
UNION
SELECT  4,'Total', SUM(todep) , SUM(tosc), SUM(toas)
FROM students
UNION 
SELECT 3,'Average',  ROUND( AVG(todep), 2 ) avg_todep, ROUND( AVG(tosc), 2 ) avg_tosc, ROUND( AVG( toas ), 2 ) avg_toas
FROM students
UNION
SELECT 1,'Min', MIN(todep), MIN(tosc), MIN(toas)
FROM students 
UNION
SELECT 2,'Max', MAX(todep), MAX(tosc), MAX(toas)
FROM students 
ORDER by 1)
;


SELECT * 
FROM (
SELECT   5, inter_dom as "Student", todep as "Depression", tosc as "Social Connectedness", toas as "Acculturative Stress" -- corrected
FROM students
UNION
SELECT  4,'Total', SUM(todep) , SUM(tosc), SUM(toas)
FROM students
UNION 
SELECT 3,'Average',  ROUND( AVG(todep), 2 ) avg_todep, ROUND( AVG(tosc), 2 ) avg_tosc, ROUND( AVG( toas ), 2 ) avg_toas
FROM students
UNION
SELECT 1,'Min', MIN(todep), MIN(tosc), MIN(toas)
FROM students 
UNION
SELECT 2,'Max', MAX(todep), MAX(tosc), MAX(toas)
FROM students 
ORDER by 1) 
WHERE "Student" = 'Inter'
;

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