一个简单的SQL语句的问题

select a.name as 姓名,a.number1 as n1,a.number2 as n2
from (select name,
number1=sum(case english between 60 and 90 then 1 else 0 end),
number2=sum(case maths between 60 and 90 then 1 else 0 end)
from table
group by name ) a

为何总是报错:BETWEEN附近有语发错误
请指点,谢谢