project 3- case study 2

I am doing my project 3 (operation analytics and investigating metric spike) case study 2. I have seen the video of importing large database in mysql and having issue i.e all my query i have performed is correct and while getting my result userid, companyid, language, activatedat, state, createdat so the details in createdat colum is all null but in the given video there is no null in createdat column what should i do now?? Is it okay if there is a null column? Can I move forward? Give me an answer asap. Thankyou so much PFA