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

Well, nothing I used worked, so I decided creating a real simple split function, hope it helps:

    DECLARE inipos INTEGER;
    DECLARE endpos INTEGER;
    DECLARE maxlen INTEGER;
    DECLARE item VARCHAR(100);
    DECLARE delim VARCHAR(1);

    SET delim = '|';
    SET inipos = 1;
    SET fullstr = CONCAT(fullstr, delim);
    SET maxlen = LENGTH(fullstr);

    REPEAT
        SET endpos = LOCATE(delim, fullstr, inipos);
        SET item =  SUBSTR(fullstr, inipos, endpos - inipos);

        IF item <> '' AND item IS NOT NULL THEN           
            USE_THE_ITEM_STRING;
        END IF;
        SET inipos = endpos + 1;
    UNTIL inipos >= maxlen END REPEAT;