Question

我有一个样本呼叫中心系统的5个表

表是

员工（身份证 - 姓名）
号码（ID - 号码）
Call_Log（ID - EmployeeID - Number_ID - Call_Status）
发票（ID - Call_Log - EmployeeID - 日期）
Invoice_Details（ID - InvoiceID - ProductName）

我有两种类型的员工

首先打电话告诉客户新的优惠，然后在Call_Log表中保存呼叫数据
第二类员工根据通话状态创建发票（如果客户想购买某些产品，第一位员工将与客户结束通话，第二位员工将再次打电话给他并创建发票）

我想选择

第一次致电的员工
创建发票的员工
发票ID
发票日期

Answer 1

我认为这是你的答案......

其他请发表评论。会帮助你

第一次通话的员工

select Employee.ID, Employee.Name from Call_Log 
inner join Employee on Call_Log.EmployeeID = Employee.ID
where Call_Log.Call_Status = 'ReadyToBuy' /*or some constants which mention the status, whether the customer ready or not to buy*/

创建发票的员工

select Employee.ID, Employee.Name from Invoic 
inner join Employee on Invoic.EmployeeID = Employee.ID

发票

select Invoic.*, Invoic_Details.ProductName from Invoic 
inner join Invoic_Details on Invoic.ID = Invoic_Details.InvoiceID

发票日期
```
select Date from Invoic
```

Answer 2

select call_log.employee_id ,invoice.employee_id,invoice.id,invoice.date
from call_log inner join invoice on call_log.id=invoice.call_log_id
where call_status='ReadytoBuy';

我认为这应该有用。

Answer 3

试试这个..

SELECT t2.NAME
    ,t5.NAME
    ,t3.ID
    ,t3.creation_date
FROM @call_log t1
INNER JOIN @Employee t2 ON t2.employee_id = t1.employee_id
    AND STATUS = 'invoiced'
INNER JOIN @invoice t3 ON t3.call_log_id = t1.ID
LEFT JOIN @call_log t4 ON t1.num_id = t4.num_id
    AND t4.STATUS = 'started_call'
LEFT JOIN @Employee t5 ON t4.employee_id = t5.employee_id

sql查询获取特定行

3 个答案: