Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8mb4_general_ci,COERCIBLE) for operation '<='
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You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '-5, 5' at line 1
In: Weichbold, M., Bacher J. & Wolf, J., Umfrageforschung Herausforderungen und Grenzen: VS Verlag für Sozialwissenschaften
Link: http://www.vs-verlag.de/Buch/978-3-531-16319-2/Umfrageforschung.html
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