Sql server 如何在存储过程中使用多个select sum（）查询

我有一个存储过程

challan

，它正在为fee challan工作

但是现在我想展示通过四个查询的帮助而收到的会费

我想在我的

challan

存储过程中添加这两个：

create proc [dbo].[challan]
    @sessionid int,
    @month nvarchar(20)
as
    select distinct 
        student.Student_id as [A/c #], student.Student_Name, 
        parent.father_name, class.class_numeric, invoice.Fee_description, 
        invoice.Amount, invoice.issue_date, invoice.month 
    from 
        student
    join 
        parent on student.father_nic = parent.father_nic
    join 
        allocate_class on student.Student_id = allocate_class.Student_id
    join 
        class on class.class_id = allocate_class.class_id
    join 
        session on allocate_class.session_id = session.session_id
    join 
        invoice on student.Student_id = invoice.Student_id
    where 
        session.session_id = @sessionid 
        and student.status = 'active' 
        and invoice.month = @month
    order by 
        class.class_numeric asc

此查询用于收集当月费用，该费用将从应付款中减去，因为它已显示在

challan

中：

SELECT 
    SUM(invoice.Amount) 
FROM 
    invoice 
WHERE 
    invoice.month = 'November-2019' 
    AND invoice.Student_id = '115' 

现在我运行另外两个，它是发票表中所有

challan

学生的总和，我必须从中减去当月费用

SELECT SUM(invoice.Amount) 
FROM invoice 
WHERE invoice.Student_id = '115

这用于汇总接收表中学生的所有已收费用：

SELECT SUM(Recipt.Paid_amount) 
FROM Recipt 
WHERE Recipt.Student_id = '115'

---

现在的问题是从上面的1）和2）个查询中减去3）个查询，然后放入

challan

存储过程的最后一个。

您可以使用CASE条件来实现相同的结果

    select 
    student.Student_id as [A/c #], student.Student_Name, parent.father_name,class.class_numeric, invoice.Fee_description, invoice.Amount, invoice.          issue_date, invoice.month ,
    SUM(CASE WHEN invoice.month = 'November-2019' AND invoice.Student_id = '115' THEN invoice.Amount ELSE 0 END)
from student
join parent on student.father_nic = parent.father_nic
join allocate_class on student.Student_id = allocate_class.Student_id
join class on class.class_id = allocate_class.class_id
join session on allocate_class.session_id = session.session_id
join invoice on student.Student_id = invoice.Student_id
where session.session_id=  @sessionid AND student.status = 'active' AND invoice.month = @month
order by class.class_numeric asc

---

Msg 8120，第16级，状态1，第2行列“student.student_id”在选择列表中无效，因为它不包含在聚合函数或GROUP BY子句中。选择SUM（当invoice.MOUNT='2019年11月'和invoice.student_id='115'然后是invoice.Amount ELSE 0 END时）从student.father\u nic=parent.father\u nic在student.student\u id=allocate\u class.student\u id在class.class\u id=allocate\u class.class\u id在allocate\u class.session\u id=session.session\u id在student.student\u id=invoice.student\u id在session.session\u id中加入会话student.status='active'和invoice.month=@monthbro它与我已经提到的查询号具有相同的工作方式..我的任务是从上述三个查询中进行一个查询，或者使用多个查询的存储过程