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 UPDATE `npc_types` SET `class` = 71 WHERE `lastname` LIKE '%Mercenary Liaison%';
 not:
 
 UPDATE 'npc_types' SET 'class' = 71 WHERE 'lastname' LIKE '%Mercenary Liaison%';
 
 The ` and ' have different uses. You could just not use the ` at all and would still work, but anyways..
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