Question

there is a sql query problem in which i should find out which users have passed all of the tests.
here are the tables:

ex: nameoftable(nameofcolumns)

user(userid,password)

test(test#,creditpertrue,negperfalse,total,neededcredit)

{creditpertrue=points given per a right answer and negperfalse=points taken per a wrong answer
and total=is the total points of a test and neededcredit is the points to pass the test}

question(test#,q#,truechoice#)

user_test(userid,test#)

{this table shows that which user have taken which test(a user can only take a test once)}

user_test_question(uesrid,test#,q#,userchoice#)
{this table shows the choice of every user in every test and question# which may be wrong or right}

now the question is this:
find out the userid of users that have passed all of the tests.

a solution that came to my mind was this:

create 2 views like this:
view1:userid,test#,numberofrightchoices

and

view2:userid,test#,numberofwrongchoices

and then use a select on these 2views and use numberofrightchoices*creditpertrue-numberofwrongchoices*negperfalse>=neededcredit

is it possible?

Answer 1

I think that the query that you need to get a list of users who have passed all the tests would be this:

select userid,
from user_test
where userid not in (
    Select 
        userid
    from    
        (select t0.test#,t2.uesrid, neededcredit,
            Sum(case when t1.truechoice# = userchoice# then t0.creditpertrue else -negperfalse end) as User_Test_Points
        from test t0 left join   
            question t1 on (t0.test# = t1.test#) left join
                user_test_question t2 on (t1.q# = t2.q#)
        where t2.uesrid is not null
        Group by t0.test#,t2.uesrid,neededcredit )
    Where Test_Results.User_Test_Points < Test_Results.neededcredit )