Meta Data Engineer interview questions

SQL ==> Sales, promotions, products DB I was able to complete only 3 questions. Python ==> solved only 3 questions. find giving letter in a string Replace None with previous element from List, there was some challenges [None] [None,1,2] ==> [None,1,2] [1,None,2] ==> [1,2,2] [1,4,None,None,3]===> [1,4,4,4,3] Forgot one question In the SQL part, please make sure you learn how to calculate %

Basic data structure and sql statement at a very high level short answers