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)

DataFrameavailable as

students

variable

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

DataFrameavailable as

df4

variable

SELECT 
		COUNT(*) AS total_records
FROM 'students.csv'
;

DataFrameavailable as

df1

variable

SELECT 
		inter_dom
		,COUNT(*) AS count_inter_dom
FROM 'students.csv'
GROUP BY inter_dom;

DataFrameavailable as

df2

variable

SELECT 
		*
FROM 'students.csv'
WHERE inter_dom = 'Inter';

DataFrameavailable as

df3

variable

SELECT 
		*
FROM 'students.csv'
WHERE inter_dom = 'Dom';

DataFrameavailable as

df4

variable

SELECT 
		*
FROM 'students.csv'
WHERE inter_dom IS NULL;

DataFrameavailable as

df5

variable

SELECT 
	ROUND(MIN(todep),2) AS min_phq,
	ROUND(MAX(todep),2) AS max_phq, 
	ROUND(AVG(todep),2) AS avg_phq 
	
FROM 'students.csv'

DataFrameavailable as

df6

variable

SELECT 
	ROUND(MIN(tosc),2) AS min_scs,
	ROUND(MAX(tosc),2) AS max_scs, 
	ROUND(AVG(tosc),2) AS avg_scs 
	
FROM 'students.csv'

DataFrameavailable as

df7

variable

SELECT 
	ROUND(MIN(toas),2) AS min_as,
	ROUND(MAX(toas),2) AS max_as, 
	ROUND(AVG(toas),2) AS avg_as 
	
FROM 'students.csv'

DataFrameavailable as

df8

variable

SELECT 
	ROUND(MIN(todep),2) AS min_phq,
	ROUND(MAX(todep),2) AS max_phq, 
	ROUND(AVG(todep),2) AS avg_phq,
	
FROM 'students.csv'
WHERE inter_dom = 'Inter';

DataFrameavailable as

df10

variable

SELECT 
	ROUND(MIN(tosc),2) AS min_scs,
	ROUND(MAX(tosc),2) AS max_scs, 
	ROUND(AVG(tosc),2) AS avg_scs 
	
FROM 'students.csv'
WHERE inter_dom = 'Inter'

DataFrameavailable as

df11

variable

SELECT 
	ROUND(MIN(toas),2) AS min_as,
	ROUND(MAX(toas),2) AS max_as, 
	ROUND(AVG(toas),2) AS avg_as 
	
FROM 'students.csv'
WHERE inter_dom = 'Inter'

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