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- UPDATE `assignments` SET `PlayerId`='45' WHERE `CampaignId`='3' AND `PlayerId`='2101'
- AND NOT EXISTS ( SELECT NULL FROM `assignments` WHERE `CampaignId`='3' AND `PlayerId`='2101' )
- #1093 - Table 'assignments' is specified twice, both as a target for 'UPDATE' and as a separate source for data
- ON DUPLICATE KEY DELETE
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