我必须得到查询结果中的第二大计数

Question

我正在使用测试数据库Advetureworks，并且想要获得结果中第二高的计数，但我没有得到它。

我必须对以下查询进行哪些更改以获得所需的结果？

select pa.City,psp.Name,COUNT(he.EmployeeID) as emp_count 
from HumanResources.EmployeeAddress hea 
join HumanResources.Employee he on he.EmployeeID=hea.EmployeeID 
join Person.Contact pc on pc.ContactID=he.ContactID 
join Person.Address pa on pa.AddressID=hea.AddressID 
join Person.StateProvince psp on psp.StateProvinceID=pa.StateProvinceID 
where COUNT(he.EmployeeID) < (select max(count(he.employeeid)) from HumanResources.Employee) 

group by pa.City,psp.Name 

Answer 1

您可以使用排序功能，尝试这样的：

;WITH a AS (
    select pa.City,psp.Name,COUNT(he.EmployeeID) as emp_count 
    from HumanResources.EmployeeAddress hea 
    join HumanResources.Employee he on he.EmployeeID=hea.EmployeeID 
    join Person.Contact pc on pc.ContactID=he.ContactID 
    join Person.Address pa on pa.AddressID=hea.AddressID 
    join Person.StateProvince psp on psp.StateProvinceID=pa.StateProvinceID 
    group by pa.City,psp.Name 
), b AS (
    SELECT *, 
      ROW_NUMBER() OVER (ORDER BY emp_count DESC) num 
    FROM a 
) 
SELECT * 
FROM b 
WHERE b.num = 2 

Answer 2

我知道有这样做的发表伊万G的ROW_NUMBER方式，但我永远记得的语法所以这里稍微不同的方法：

with top_cities (City, Name, emp_count) as 
(
    select top 2 
    pa.City,psp.Name,COUNT(he.EmployeeID) as emp_count 
    from 
    HumanResources.EmployeeAddress hea 
    join HumanResources.Employee he on he.EmployeeID=hea.EmployeeID 
    join Person.Contact pc on pc.ContactID=he.ContactID 
    join Person.Address pa on pa.AddressID=hea.AddressID 
    join Person.StateProvince psp on psp.StateProvinceID=pa.StateProvinceID   
    group by 
    pa.City,psp.Name 
    order by 
    emp_count desc 
) 
select top 1 * from top_cities order by emp_count asc