Apex error 'List has no rows for assignment to SObject'
The following query is not returning any number of records: "[SELECT Id FROM Account WHERE Id = :Trigger.new[0].Account__c]" The error "List has no rows for assignment to SObject" occurs when query doesn't return any rows.
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What’s not obvious is that it also assumes that exactly one row is returned! Although this is unlikely to occur for Contact, it is highly likely to occur for any custom objects you create, especially when a WHERE statement is used that might return zero rows, such as: