A Database Error Occurred

Error Number: 1242

Subquery returns more than 1 row

SELECT DISTINCT `buch_id` FROM (`schlagworte`) WHERE `m1_id` = (SELECT murbel1.id FROM murbel1 WHERE murbel1.name LIKE "Wirtschaft%Ökonomie") AND `m2_id` = (SELECT murbel2.id FROM murbel2 WHERE murbel2.name LIKE "Management") AND `m3_id` = (SELECT murbel3.id FROM murbel3 WHERE murbel3.name LIKE "E%Management")

Filename: /media/nss/PUBLIC/webserver/www/ikm/bib/models/model_search.php

Line Number: 250