任何人都可以尝试如何解决此表结构的查询？

Question

员工表结构

first_name varchar2(100)
last_name  varchar2(100)
hire_date  date

显示在雇用最多员工的当天雇用的所有员工？

Answer 1

试试这个

   select top 1 * from( 
    select count(first_name) as countemp from employee
    where hire_date between DATEADD(day,-7,getdate())
                        and  getdate()
 group by(hire_date)   ) d order by countemp desc

Answer 2

select first_name, last_name from employee 
where 
DAYNAME(hired_date) = (
select top 1 dow 
from (
select COUNT(first_name) as cnt, DAYNAME(hire_date) as dow 
from employee
group by (dow)
order by cnt desc
)
)

这是用mysql，但我确定在db2，oracle，ms sql server等中有类似的功能。