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+-- 
+-- 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
+;
+
+--
+-- 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";
+