Question

我是SQL Server的新手，刚开始玩它。我正在尝试创建一个按部门显示出勤率的表格。

首先我运行此查询：

SELECT CrewDesc, COUNT(*)
FROM database.emp
    INNER JOIN database.crew on sim1 = sim2
GROUP BY CrewDesc

这给出了一个这样的表：

Accounting     10
Marketing      5
Economics      20
Engineering    5
Machinery      5
Tech Support   10

然后我再次运行查询：

SELECT DeptDescription, COUNT(*)
FROM database.Attendee
GROUP BY DeptDescription

这给了我参加会议的所有人的结果

Accounting     8
Marketing      5
Economics      15
Engineering    10
Tech Support   8

然后我按SELECT Datepart(ww, GetDate()) as CurrentWeek获得当年的当前一周。为了让这个例子变得简单，我们假设这将是一周“2”。

现在我要创建这个的方式是每个步骤的表格，但这似乎是浪费。有没有办法可以在查询中组合表格？所以在最终的结果我想要一个像这样的表

            Total#     Attd    Week  (Total*Week)       Attd/(Total*week)%
Accounting     10       8       2        20                 8/20
Marketing      5        5       2        10                 5/10
Economics      20       15      2        40                 15/40
Engineering    5        10      2        10                 10/10
Machinery      5        NULL    2        10                 0/10
Tech Support   10       8       2        20                 8/20

Answer 1

好的，请注意，我在下面的建议是基于您确切的现有查询 - 当然还有其他方法来构建这些可能更高效的方法，但从功能上来说，这应该适合您的要求。此外，它还说明了与您的请求相关的不同连接类型的关键功能，以及内联视图（也称为嵌套查询），它们是SQL语言中的超级强大技术。

select t1.CrewDesc, t1.Total, t2.Attd, t3.Week, 
    (t1.Total*t3.Week) as Total_x_Week, 
    case when isnull(t1.Total*t3.Week, 0) = 0 then 0 else isnull(t2.Attd, 0) / isnull(t1.Total*t3.Week, 0) end as PercentageAttd
from (
    SELECT CrewDesc, COUNT(*) AS Total
    FROM database.emp INNER JOIN database.crew on sim1 = sim2 
    GROUP BY CrewDesc
) t1
left outer join /* left outer to keep all rows from t1 */ (
    SELECT DeptDescription, COUNT(*) AS Attd 
    FROM database.Attendee GROUP BY DeptDescription
) t2
on t1.CrewDesc = t2.DeptDescription
cross join /* useful when adding a scalar value to all rows */ (
    SELECT Datepart(ww, GetDate()) as Week
) t3
order by t1.CrewDesc

祝你好运！

Answer 2

尝试这样的事情

SELECT          COALESCE(a.crewdesc,b.deptdescription), 
                a.total, 
                b.attd, 
                Datepart(ww, Getdate()) AS week, 
                total * Datepart(ww, Getdate()), 
                b.attd/(a.total*Datepart(ww, Getdate())) 
FROM            (query 1) a 
FULL OUTER JOIN (query 2) b 
ON              a.crewdesc = b.deptdescription

Answer 3

我假设您的查询是正确的 - 您没有提供有关您的模型的真实信息，因此我无法知道。它们看起来不对，因为相同的数据在一个表中称为CrewDesc而在另一个表中称为Dept。加入sim1 = sim2对我来说似乎很奇怪。在任何情况下，如果您发布的查询都可以使用。

With TAttend as
(
  SELECT CrewDesc, COUNT(*) as TotalNum
  FROM database.emp
  INNER JOIN database.crew on sim1 = sim2
  GROUP BY CrewDesc 
), Attend as
(
  SELECT DeptDescription, COUNT(*) as Attd
  FROM database.Attendee
  GROUP BY DeptDescription  
)
SELECT CrewDesc as Dept, TotalNum, ISNULL(Attd, 0) as Attd ,Datepart(ww, GetDate())  as Week, 
       CASE WHEN ISNULL(Attd, 0) > 0 THEN 0 
            ELSE ISNULL(Attd, 0) / (TotalNum * Datepart(ww, GetDate()) ) END AS Percent
FROM TAttend
LEFT JOIN Attend on CrewDesc = DeptDescription

Answer 4

            @Override
        public void setRequestHandler(RequestHandler requestHandler) {
            //store requestHandler somewhere accessible. 
        }

无法在sql中运行复杂查询？

4 个答案: