trigger AWS lambda function from SQS that already has messages in it

Question

If I set a trigger for lambda function from SQS that already has messages in it, will the existing messages trigger the lambda function? or that only new arriving messages will trigger it? If the old messages won't trigger the lambda function automatically, is there a manual way that will still trigger the lambda function to read the old messages?

Edit: After testing that, the answer is YES. The existing messages do trigger the lambda function.

Answer 1

After testing that, the answer is YES. The existing messages do trigger the lambda function.