TABLE 'People':

NAME   ID
---------
Alice  1
Bob    2

TABLE 'Qualifications':

QUAL   ID
---------
MA     1
MSc    2
PhD    3

TABLE 'people_who_have_qualifications':

PERSON QUAL
1      1 # Alice has an MA
1      3 # Alice also has a PhD
2      2 # Bob has an MSc.