1.for q4 of the written portion,i used case since we only have to sort by fName if the lname is the same?is that accepted or do we have to use order by only? 2.for q7 of written portion,i used and equijoin instead of a left join but i have specified that where can be null so it will return both null and not null queries.is that ok?(added note:isnt union all the same as union?) 3.for q8 of written portion,can we select fname,lname from staff then do join on parking lot and covered using spaceNo and set where condition of capacity>50?the subquery is the join parking lot portion also just to confirm transactions isnt included in the exam right?