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 Faulbaum, Frank (ed.): Qualitätssicherung in der Umfrageforschung: Neue Herausforderungen für die Markt- und Sozialforschung (Schriftenreihe der ASI - Arbeitsgemeinschaft Sozialwissenschaftlicher Institute)
Data has been last edited on Jan 29 2013