mysql - best way to store multiple values

Ben Derby :

I am trying to create a question bank to help students access material during the pandemic.

I want to be able to classify each question so that students can go and search for specific topics at ease, and I am planning to store question-specific data in a table.

However, I'm finding it a bit difficult on the best way to store question specific data in a table.

For example, a probability question can be associated with multiple tags eg 'independence', 'mutually exclusive', 'tree diagram', but I can't have a variable number of tags in a single cell. And it is not possible to have an infinite number of columns in a given row.

Or maybe I am incorrect, is it possible to store an array of such tags in a single cell in MySQL? Does anyone have any more effective solutions?

Tarik :

Well, you need have a many to many relationship and need three tables:

question table
    QuestionId, QuestionText
    1.        Is Corona contagious?
    2         Malaria medication
    3.        Flue medication

tag table
    TagId, TagText
     1         Contagious
     2         Virus
     3.        Medication

question_tag table
    QuestionId, TagId
       1                   1
       1.                  2
       2.                  3
       3.                  2
       3.                  3

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