没有AFAIK这样的功能。但是，编写查询来计算该值很容易：

There is AFAIK no such function. It is however easy to write a query that calculates this:

with cal(d) as ( 
    values date('2015-01-01') -- start_date 
    union all 
    select d + 1 day from cal 
    where d < '2015-01-15'    -- end_date 
) select count(case when dayofweek(d) between 2 and 6 then 1 end) 
  from cal;

如果您进行了大量此类计算，则可能要创建日历表，则可以在此表中添加国定假日等属性。

If you do a lot of these kind of calculations you might want to create a calendar table, you can add attributes like national holiday etc to this table.