SELECT name, lehrernr
      FROM sar_lehrer
      WHERE vorname  IN
      (
            SELECT vorname
            FROM sar_lehrer
            WHERE vorname = 'Walter'
      );

SELECT  name, thema
        FROM  sar_lehrer AS l, sar_projekt AS p
        WHERE l.prowonr = p.prowonr;

SELECT name,thema, anzahl * lehrernr AS unsinn
        FROM  sar_lehrer AS l, sar_projekt AS p
        WHERE l.prowonr = p.prowonr;


SELECT name, klasse, thema
      FROM sar_wahl AS w, sar_projekt AS p, sar_schueler AS s
      WHERE w.prowonr = p.prowonr
      AND   w.schuelernr = s.schuelernr
      ORDER BY klasse, name;

SELECT count(name)
       FROM sar_wahl AS w, sar_projekt AS p, sar_schueler AS s
       WHERE w.prowonr = p.prowonr
       AND   w.schuelernr = s.schuelernr
       AND p.thema = 'Easy-Webdesign';

SELECT thema, count(*)
      FROM sar_wahl AS w, sar_projekt AS p, sar_schueler AS s
      WHERE w.prowonr = p.prowonr
      AND   w.schuelernr = s.schuelernr
      GROUP BY thema;

SELECT thema, count(*)
      FROM sar_wahl AS w, sar_projekt AS p, sar_schueler AS s
      WHERE w.prowonr = p.prowonr
      AND   w.schuelernr = s.schuelernr
      GROUP BY thema
      HAVING count(*) < 10;

SELECT thema, count(*)
      FROM sar_wahl AS w, sar_projekt AS p, sar_schueler AS s
      WHERE w.prowonr = p.prowonr
      AND   w.schuelernr = s.schuelernr
      GROUP BY thema
      HAVING count(*) BETWEEN 5 AND 8;

# gibt Fehlermeldung!
SELECT name, klasse, thema, count(*)
      FROM sar_wahl AS w, sar_projekt AS p, sar_schueler AS s
      WHERE w.prowonr = p.prowonr
      AND   w.schuelernr = s.schuelernr
      GROUP BY thema;


SELECT name,klasse,thema, count(*)
      FROM sar_wahl AS w, sar_projekt AS p, sar_schueler AS s
      WHERE w.prowonr = p.prowonr
      AND   w.schuelernr = s.schuelernr
      GROUP BY thema,klasse,name;


CREATE VIEW prowo
       AS SELECT prowonr, thema, anzahl
       FROM sar_projekt;

SELECT * FROM prowo; 
