reporting services - SSRS - Counting Correct Answers and Calculating Percentages via Comparison Fails -

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this first time using ssrs, gentle! i'm working on report want compare number of correct answers number of user answers group. group repeats , looks set okay, part isn't worry. it's calculation of field seems worry.

here's dataset:

    topicid topicname   groupscore  totalpossible   questionid  question                       correctanswer    groupanswerscore    useranswer     1       test topic  2            1               6          when did start?              1917            1                   1896     1       test topic               1               3053       1200th governor?    olestra chyppin 1                   brent spoon     1       test topic  2            1               3053       1200th governor?    olestra chyppin 1                   olestra chyppin

this query calculate percentage based on correct answers compared answers not work:

=iif(fields!useranswer.value=fields!correctanswer.value,1,0)/count(fields!useranswer.value))

likewise, query find number of correct answers doesn't work:

=iif(fields!useranswer.value=fields!correctanswer.value,1,0)

both return either 0 (if reverse order on percentage portion) or "infinity". i'd appreciate can offer!

you need aggregate of data set. in case use sum. statement evaluates single row , unclear row. statement find total number of correct answers 

=sum(iif(fields!useranswer.value=fields!correctanswer.value,1,0))

you may need include scope if have groupings in report. see ssrs documentation here more information.


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