-- 
-- connection of inner, left and right joins. See slide 9
--
SELECT cntry.name
	  ,prv.name
	  ,gm.mountain
	  ,brds.country1
	FROM "IDBS01_Q12025"."Country" cntry
	INNER JOIN "IDBS01_Q12025"."Province" prv
		ON cntry.code = prv.country
	LEFT OUTER JOIN "IDBS01_Q12025"."geo_Mountain" gm
		ON prv.country = gm.country
			AND prv."name" = gm.province
	RIGHT OUTER JOIN "IDBS01_Q12025"."borders" brds
		 ON brds.country1 = cntry.code
limit 10;

--
-- Difference UNION and UNION ALL
--
SELECT cntry.name
	FROM "IDBS01_Q12025"."Country" cntry
UNION
SELECT cntry.name
	FROM "IDBS01_Q12025"."Country" cntry
ORDER BY 1
limit 10;

--
-- Transferaufgabe
--

--
-- Aufgabe 1
--

SELECT city."name" AS Stadtname
	  ,city.population AS  Bevoelkerung
	FROM "IDBS01_Q12025"."Country" cntry
	RIGHT OUTER JOIN "IDBS01_Q12025"."City" city
		ON cntry.code = city.country
	WHERE cntry."name" = 'Austria'
;

--
-- Aufgabe 2
--

SELECT borderCnrty."name" AS Grenzland
	  ,borderCnrty.population AS Bevoelkerung
	FROM "IDBS01_Q12025"."Country" cntry
	INNER JOIN "IDBS01_Q12025"."borders" brds1
		ON brds1.country1 = cntry.code
	INNER JOIN "IDBS01_Q12025"."Country" borderCnrty
		ON borderCnrty.code = brds1.country2
	WHERE cntry."name" = 'Germany'
	ORDER BY brds1.length DESC
;

--
-- Aufgabe 3
--

CREATE VIEW "IDBS01_Q12025"."BorderCountry" AS
	SELECT borderCnrty."name" AS Grenzland
		  ,borderCnrty.population AS Bevoelkerung
		FROM "IDBS01_Q12025"."Country" cntry
		INNER JOIN "IDBS01_Q12025"."borders" brds1
			ON brds1.country1 = cntry.code
		INNER JOIN "IDBS01_Q12025"."Country" borderCnrty
			ON borderCnrty.code = brds1.country2
		WHERE cntry."name" = 'Germany'
		ORDER BY brds1.length DESC
;

DROP VIEW "IDBS01_Q12025"."BorderCountry";

--
-- Aufgabe 4
--

SELECT *
	FROM "IDBS01_Q12025"."borders"
	WHERE country1 = 'BY'
;

START TRANSACTION;
INSERT INTO "IDBS01_Q12025"."borders" (Country1, Country2, Length) VALUES ('PL','BY',605);
INSERT INTO "IDBS01_Q12025"."borders" (Country1, Country2, Length) VALUES ('BY','PL',605);
COMMIT;

START TRANSACTION;
DELETE FROM "IDBS01_Q12025"."borders"
	WHERE country1 = 'PL'
		AND country2 = 'BY'
;
DELETE FROM "IDBS01_Q12025"."borders"
	WHERE country1 = 'BY'
		AND country2 = 'PL'
;
COMMIT;

--
-- Aufgabe 5
--

SELECT *
	FROM "IDBS01_Q12025"."Country" cntry
	WHERE cntry.code = 'EAU'
;


START TRANSACTION;
UPDATE "IDBS01_Q12025"."Country" SET Population = 44270000 WHERE Code = 'EAU';
COMMIT;

START TRANSACTION;
UPDATE "IDBS01_Q12025"."Country" SET Population = 20158176 WHERE Code = 'EAU';
COMMIT;

--
-- Aufgabe 6
--
CREATE TABLE "IDBS01_Q12025"."BevoelklerungNeu"
	(ID INTEGER
	,LandCode VARCHAR(4)
	,datum DATE
	,population INTEGER
	,PRIMARY KEY(ID))
;

DROP TABLE "IDBS01_Q12025"."BevoelklerungNeu";