diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..3bb4e74
Binary files /dev/null and b/.DS_Store differ
diff --git a/kosten/create_table.sql b/kosten/create_table.sql
new file mode 100644
index 0000000..ea902f3
--- /dev/null
+++ b/kosten/create_table.sql
@@ -0,0 +1,13 @@
+CREATE TABLE kosten
+(
+	beschreibung CHARACTER VARYING,
+	projekt_id INTEGER,
+	betrag NUMERIC(6,2)
+);
+
+INSERT INTO kosten VALUES
+	('Telefon', 1, 98.5),
+	('Reisekosten', 1, 466.20),
+	('Material', 1, 235.60),
+	('Reisekosten', 2, 120.60),
+	('Material', 2, 32.20);
\ No newline at end of file
diff --git a/kosten/select_exercise.sql b/kosten/select_exercise.sql
new file mode 100644
index 0000000..0032966
--- /dev/null
+++ b/kosten/select_exercise.sql
@@ -0,0 +1,18 @@
+-- Selektieren Sie die Summe der Kosten pro Projekt
+SELECT projekt_id, sum(betrag) 
+FROM kosten
+GROUP BY projekt_id;
+
+-- Selektieren Sie die höchsten und niedrigsten Positionen für jede Kategorie ("Beschreibung")
+SELECT beschreibung, min(betrag), max(betrag) 
+FROM kosten
+GROUP BY beschreibung;
+
+-- Zählen Sie (mit SQL) die Anzahl Zeilen in der Tabelle "Kosten" (verwenden Sie COUNT ohne GROUP BY)
+SELECT COUNT(projekt_id)
+FROM kosten;
+
+-- Erzeugen Sie eine Übersichtstabelle: Projekt, Liste der Beschreibungen (Tipp: string_agg)
+SELECT projekt_id, SUM(betrag), STRING_AGG(beschreibung, ',')
+FROM kosten
+GROUP BY projekt_id;
\ No newline at end of file
diff --git a/movies/movies.sql b/movies/movies.sql
index 3bf8309..051054d 100644
--- a/movies/movies.sql
+++ b/movies/movies.sql
@@ -1,19 +1,21 @@
-/*CREATE TABLE movies
+DROP TABLE IF EXISTS movies;
+
+CREATE TABLE movies
 (
-	id INTEGER PRIMARY KEY,
+	id INTEGER PRIMARY KEY, /*Use SERIAL for auto increment*/
 	year INTEGER,
 	score INTEGER,
 	title CHARACTER VARYING NOT NULL
-);*/
+);
 
-/*INSERT INTO movies (id, year, score, title) VALUES
-(1, 1976, 99, 'Taxi Driver'),
-(2, 1978, 93, 'The Deer Hunter'),
-(3, 1985, 98, 'Brazil'),
-(4, 1990, 96, 'Goodfellas'),
-(5, 1991, 76, 'Cape Fear'),
-(6, 1995, 80, 'Casino'),
-(7, 1995, 86, 'Heat'),
-(8, 2000, 84, 'Meet the Parents');*/
+INSERT INTO movies (id, year, score, title) VALUES
+	(1, 1976, 99, 'Taxi Driver'),
+	(2, 1978, 93, 'The Deer Hunter'),
+	(3, 1985, 98, 'Brazil'),
+	(4, 1990, 96, 'Goodfellas'),
+	(5, 1991, 76, 'Cape Fear'),
+	(6, 1995, 80, 'Casino'),
+	(7, 1995, 86, 'Heat'),
+	(8, 2000, 84, 'Meet the Parents');
 
 SELECT * FROM movies
\ No newline at end of file
diff --git a/movies/select_basics.sql b/movies/select_basics.sql
new file mode 100644
index 0000000..acd7f42
--- /dev/null
+++ b/movies/select_basics.sql
@@ -0,0 +1,3 @@
+SELECT title FROM movies;
+SELECT title, year FROM movies;
+SELECT year%100 AS "Jahrzehnt", title FROM movies;
\ No newline at end of file