如何写两个select语句在一个查询的一个结果

Question

如何写两个select语句在一个查询的一个结果，我希望两个SELECT语句的一个结果相结合的平均

结果查询，如： -

select (idcount/days) as avg 

QUERY1： -

select distinct COUNT(id) as idcount 
from employee 
where joiningdate between CONVERT(varchar,@fromdate,103) and CONVERT(varchar,@TODATE,103) 

QUERY2： -

select DATEDIFF(d,@FromDate,@todate) as days 

Answer 1

这样

;WITH CTE AS(
    SELECT COUNT(DISTINCT id) AS idcount 
    FROM employee 
    WHERE joiningdate BETWEEN CONVERT(varchar,@fromdate,103) and CONVERT(varchar,@TODATE,103) 
) 
SELECT idcount/(DATEDIFF(d,@FromDate,@todate)) AS AV 
FROM CTE