-- 1-to-1-relationship
SELECT *
	FROM "IDBS01_Q12025"."Population" AS population
	inner join "IDBS01_Q12025"."Country" as ctry
		on ctry.code = population.country
;

-- 1-to-cn-relationship
SELECT *
	FROM "IDBS01_Q12025"."Country" as ctry
	FULL OUTER JOIN "IDBS01_Q12025".borders as borders
		ON ctry.code = borders.country1
;


-- 1-to-cn-relationship
SELECT *
	FROM "IDBS01_Q12025"."Country" as ctry
	LEFT OUTER JOIN "IDBS01_Q12025"."geo_Desert" AS geodes
		ON ctry.code = geodes.country
	LEFT OUTER JOIN "IDBS01_Q12025"."Desert" AS des
		on geodes.desert = des.name
;