Can you split/explode a field in a MySQL query?

Question

I have to create a report on some student completions. The students each belong to one client. Here are the tables (simplified for this question).

CREATE TAB         


        

Answer 1

Here's what I've got so far (found it on the page Ben Alpert mentioned):

SELECT REPLACE(
    SUBSTRING(
        SUBSTRING_INDEX(c.`courseNames`, ',', e.`courseId` + 1)
        , LENGTH(SUBSTRING_INDEX(c.`courseNames`, ',', e.`courseId`)
    ) + 1)
    , ','
    , ''
)
FROM `clients` c INNER JOIN `clientenrols` e USING (`clientId`)