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Editorial Team
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Asked: 2026-06-13T08:46:53+00:00

My users answer two different questions, they are added to my answers_table as one

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My users answer two different questions, they are added to my answers_table as one row each. I’m trying to count how many users have answered my questions which seems simple at first. Count(*) and divide by 2. YES! But: the users can add new questions as they go, so suddenly there might be three questions, all answers/3 becomes an incorrect number of users if there was two questions for a while and then three, for example!

Can anyone figure out a query for doing this? So far I’ve got

SELECT COUNT(DISTINCT date) as totNum FROM login_answers

But it doesn’t take the time in consideration. Meaning i just get the amount of answers in total for that day, not knowing how many questions was available that day.

Here’s my table:

qid is the QuestionID so i guess thats somewhere to start?

id      qid answer  date                deviceID
1502    2   2       2012-10-19 08:42:41 7
1503    1   3       2012-10-19 08:51:53 7
1504    2   2       2012-10-19 08:51:53 7
1505    1   4       2012-10-19 09:05:23 7
1506    2   2       2012-10-19 09:05:23 7
1507    1   4       2012-10-19 09:40:59 7
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1 Answer

  1. Editorial Team

    My proposed solution would be to store a session Id or some auto-generated key against the answers to uniquely identify a “session” of 2, 3 or more answers from a single person.

    The query would simply be

    SELECT COUNT(DISTINCT session_id) totNum
FROM login_answers

    With your current schema with no identifiable key, it’s quite hard to answer your question correctly if at all possible.

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