title: how to SET and DELETE using a single UpdateExpression with Dynamo
body: <p>I'm trying to update an item using updateExpression, and i'd like to edit an attribute and delete another attribute on the same object, but i get the following error:</p>
  
  <blockquote>
    <p>Invalid UpdateExpression: Syntax error; token: EOF near: "attributeToDelete"</p>
  </blockquote>
  
  <p>I have to admit i wrote the update expression guessing the proper way to use it (failing). Here's the code snippet:</p>
  
  <pre><code>dynamodb.updateAsync({
      TableName: `myTable`,
      Key: { id: req.params.id },
      UpdateExpression: 'SET attributeToEdit = :newValue DELETE attributeToDelete',
      ExpressionAttributeValues: { ':newValue': 'valueToSet' },
    })
  </code></pre>
  
  <p>How am i supposed to write an UpdateExpression when I want to include more than a action? (where actions are -> SET, DELETE, REMOVE, ADD)</p>