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How to create differnce bar chart

siraj_farooq

i want to make a bar chart which shows difference between results of two quizes..i am attching a screenshot i want to make such bar chart...........but file uploading problem...any one tell me what is this??????????/

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micajblock

No screenshot. Use more reply options to upload a file.

siraj_farooq

yes i did use it but max file sixe is 28 kb.....i dont now why....

micajblock

Why not create a computed column which is one result minus the other and then use that in the bar chart?

siraj_farooq

i think of that but cant figure it out what query to be written as both of quizes are in same field....what expression should i built to delete quiz 2 from quiz 3

micajblock

Here is some pseudo SQL code. select student, sum(case when quiz = 1 then quizresult1 else 0 end), sum(case when quiz = 2 then quizresult1 else 0 end)from quizzesgroup by student

siraj_farooq

thanks