Why is there no **not equal** comparison in DynamoDB queries?

Question

I try to query my table Tinpon with a secondary index yielding a partition-key category and sort-key tinponId. My goal is

Answer 1

The KeyConditionExpression doesn't allow not equals for the sort key. However, you can use the "Not Equals i.e. <>" in FilterExpression.

KeyConditionExpression : 'category = :category',    
FilterExpression : 'tinponId  <> :tinponIdVal',
ExpressionAttributeValues : {
    ':category' : 'somevalue',
    ':tinponIdVal' :  'somevalue'
}