如果我有以下数据：

# EducationalAttainment, age, sum(population_count)

'Bachelor\'s degree or higher', '00 to 17', '14673'
'Bachelor\'s degree or higher', '18 to 64', '46032757'
'Bachelor\'s degree or higher', '65 to 80+', '8570246'
'High school or equivalent', '00 to 17', '114881'
'High school or equivalent', '18 to 64', '35577621'
'High school or equivalent', '65 to 80+', '7250424'
'No high school diploma', '00 to 17', '9566523'
'No high school diploma', '18 to 64', '25353234'
'No high school diploma', '65 to 80+', '5749114'
'Some college, less than 4-yr degree', '00 to 17', '91542'
'Some college, less than 4-yr degree', '18 to 64', '44843283'
'Some college, less than 4-yr degree', '65 to 80+', '7202669'

我会写什么样的查询，把每个年龄组的人口加起来，然后计算出一个分数，比如说，那些拥有学士学位的人从00到17岁，占了这00到17岁的总人口的一小部分。
这来自以下查询：

select EducationalAttainment, age, sum(population_count) 
from educational_attainment
group by EducationalAttainment, age;