SQL查询员工表

Question

我需要帮助写SQL打印以下

表1：Emp_Master

Emp_ID FirstName 
------------------------------ 
1   John 
2   Mark 
3   Steve 

表2：Emp_Transaction

Trans ID Emp_ID Payment_Date Paid_status 
--------------------------------------------------------- 
1    1    01/07/13   True 
2    1    01/15/13   False 
3    1    01/21/13   False 
4    2    01/07/13   False 
5    2    01/15/13   False 
6    2    01/21/13   False 
7    3    01/07/13   True 
8    3    01/15/13   True 
9    3    01/21/13   False 

结果应打印像这样（最早的未付日期）

Emp_ID FirstName   Payment_Date  Paid_Status 
-------------------------------------------------------------- 
1    John     01/15/13   False 
2    Mark     01/07/13   False 
3    steve     01/21/13   Fals 

Answer 1

尝试此查询

SELECT e.Emp_ID, e.FirstName, min(Payment_Date), et.Paid_Status 
FROM Emp_Master e, Emp_Transaction et 
WHERE e.Emp_ID = et.Emp_ID AND et.Paid_Status= 'False' 
GROUP BY e.Emp_ID, e.FirstName, et.Paid_Status 

Answer 2

试试

select model1.Emp_ID , 
     model1.FirstName , 
     min(model2.Payment_Date) , 
     model2.Paid_Status 
     from Emp_Master model1 ,Emp_Transaction model2 
     where model1.Emp_ID = model2.Emp_ID GROUP BY model1.Emp_ID, model2.FirstName; 

Answer 3

您可以使用Join这个。

选择e.Emp_ID，e.FirstName，分钟（t.Payment_Date） t.Paid_status从Emp_Master E， Emp_Transaction t其中e.Emp_ID = t.Emp_ID和t.Paid_Status = '假';

Answer 4

我过分复杂，我的第一个答案。这是你需要的。

SELECT Emp_Master.Emp_ID Emp_ID, FirstName, MIN(Payment_Date) Payment_Date, Paid_Status 
FROM Emp_Master 
INNER JOIN Emp_Transaction ON Emp_Master.Emp_ID = Emp_Transaction.Emp_ID 
WHERE Paid_Status = 'false' 
GROUP BY Emp_Master.Emp_ID, FirstName, Paid_Status