Hi Tawfeeq,

Unfortunately I have not received a response from Kaniz to the follow up question I sent her. I just sent her another reply asking if she could get back to me about it. I flagged a couple of the videos in Coursera explaining the issue and I haven't heard anything yet. I'm going to send Coursera an e-mail by filling out a contact support form informing them of the issue. If I was you I would do these things as well since I think if enough students flag videos and reach out to them directly by contacting customer support I think it might get their attention. If I don't hear anything from Coursera I'm going to send UC Davis an e-mail informing them of the issue. I found an e-mail address, cpeinfo@ucdavis.edu, listed at the bottom of their web page for the course at https://extension.ucdavis.edu/section/learn-sql-basics-data-science-specialization-coursera