Combining data from multiple large tables
You need to have information for all surveys, even the ones that have no answers, right? 

;with surveys as 
    (
        select SurveyID, Region, Gender from Table1 
    )
, responses as 
    (
        select t1.SurveyID, t2.AnswerNumber, t2.Rating, t3.AnswerNumber, t3.Expediture -- add other columns from the other tables
        from Table1 t1 left join Table2 t2 on t1.SurveyId = t2.SurveyID
                   left join Table3 t3 on t1.SurveyId = t3.SurveyID
                   -- add other tables up to the 25th
    )
select s.SurveyId, s.Region, s.Gender, r.*
from surveys s left join responses r on s.SurveyId = r.SurveyID