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Group by yes or no

Posted on 2008-10-08
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Last Modified: 2012-05-05
I have fields q1-q16 that are either yes or no. How can a pull the results into a recordset using an sql statement.  Case statement?
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Question by:cseink
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by:sdstuber
ID: 22670816
select q1,q2,q3,q4,q5,q6,q7,q8,q9,q10,q11,q12,q13,q14,q15,q16 from yourtable

or, if that's too simplistic  please provide an example of what the input might look like and what you expect the output to be
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Accepted Solution

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Roger Baklund earned 50 total points
ID: 22671008
It's not very clear what you are trying to achieve. In general, you would use the SELECT statement to get the content of a table.

SELECT * FROM MyTable

This will pull the results into a recordset.

The title of your question is "Group by yes or no", so I am guessing that you wish to accumulate the rows of the table in some way. Some examples are provided below, if I am not answering your question, please provide some more information about how the result is supposed to look like.
/* count of yes/no (and unanswered) for question 1: */
SELECT q1,count(*) FROM MyTable
 
/* Sum of yes/no replies to questions q1-q4: */
SELECT
  sum(if(q1='yes',1,0)) as q1_yes,
  sum(if(q1='no',1,0)) as q1_no,
  sum(if(q2='yes',1,0)) as q2_yes,
  sum(if(q2='no',1,0)) as q2_no,
  sum(if(q3='yes',1,0)) as q3_yes,
  sum(if(q3='no',1,0)) as q3_no,
  sum(if(q4='yes',1,0)) as q4_yes,
  sum(if(q4='no',1,0)) as q4_no
  FROM MyTable

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Author Comment

by:cseink
ID: 22671023
I like to total the results e.g (5 people answered yes and 5 people answered no for q1 resulting in 50/50% split. I can handle it in a recordset  like below but was hoping it could be done in the sql statement

ql="select * from results"

rs.open sql, conn
if not rs.eof
q1=rs(q1)
if q1="yES "THEN
COUNT1= COUNT1+ 1
ELSE
...
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Expert Comment

by:folderol
ID: 22671180
select
sum(case q1 when 'Yes' then 1 else 0 end) / cast(count(q1) as decimal(10,2)) as Q1PCT
from MyTable

but your data is not normalized, it should be
respondent_id, question_id, response

then your query would be

select
sum(case response when 'Yes' then 1 else 0 end) / cast(count(response as decimal(10,2)) as Q1PCT,
question_id
from mytable
group by question_id

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LVL 39

Expert Comment

by:Roger Baklund
ID: 22671227
Then you can use the second example above:
SELECT
  sum(if(q1='yes',1,0)) as q1_yes,
  sum(if(q1='no',1,0)) as q1_no,
  sum(if(q2='yes',1,0)) as q2_yes,
  sum(if(q2='no',1,0)) as q2_no,
  sum(if(q3='yes',1,0)) as q3_yes,
  sum(if(q3='no',1,0)) as q3_no,
  sum(if(q4='yes',1,0)) as q4_yes,
  sum(if(q4='no',1,0)) as q4_no
  /* repeat this for each question */
FROM results

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