Sql server 2008 r2 如何在一个查询中为一个结果编写两个select语句

如何在一个查询中为一个结果编写两个select语句，我想将一个结果的两个select语句组合为avg

结果查询如下：-

select (idcount/days) as avg

问题1：-

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

问题2：-

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

---

试试这样想

;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  

---

试试这样想

;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  

---

对您的结果使用子查询对您的结果使用子查询在动态SQL查询中可能吗？是的，这是可能的，但您需要注意连接正确的值。我需要将其插入现有的动态SQL查询中，从何处开始，为了达到这个目的，最好的提问方式。这在动态SQL查询中可能吗？是的，这是可能的，但您需要注意连接正确的值。我需要将其插入到现有的动态SQL查询中，我应该从哪里开始？如果不看您的代码，我会情不自禁地问新问题。