我想在SQL

Question

最新记录我有两个表的员工和交易：

员工：

横贯：

现在我想通过最新的记录来自交易的日期，其中该记录具有解除标记为0，并且交易中的雇员应该等于雇员表中的雇佣合同。

输出：

1497163 SKANNAN27 0 2012-02-08 19：13：33.840

1498704 AETHODE 0 2012-02-08 18：45：08.380

我不会得到其他记录因为对于其他记录，如果我们采用最大的transdate记录，它们的执行标记为'1'。如上面的输出，我有许多记录应该检索所有。

请指导我如何实现这一目标。

Answer 1

若要获取Trans表最新TransDate（SQL Fiddle）的最后一个记录：

SELECT TOP(1) e.EmployeeID, e.EmpShortID, t.ExecutionFlag, t.TransDate 
FROM Employee AS e 
INNER JOIN Trans AS t ON t.Employee = e.EmpShortID 
WHERE t.ExecutionFlag = 0 
ORDER BY t.TransDate DESC 

编辑，拿到最后一个记录在Trans表对每个员工的最新TransDate（SQL Fiddle ）：

SELECT e.EmployeeID, e.EmpShortID, t.ExecutionFlag, MAX(t.TransDate) 
FROM Employee AS e 
INNER JOIN Trans AS t ON t.Employee = e.EmpShortID 
WHERE t.ExecutionFlag = 0 
GROUP BY e.EmployeeID, e.EmpShortID, t.ExecutionFlag 

EDIT，下面的QUER y检索Trans表中的最后一条记录，其中最新的TransDate表示每位员工，而不考虑ExecutionFlag。然后，它需要这些结果和拉只记录其中ExecutionFlag =0（SQL Fiddle）：

SELECT m.* 
FROM 
(
    SELECT e.EmployeeID, e.EmpShortID, MAX(t.TransDate) AS MaxTransDate 
    FROM Employee AS e 
    INNER JOIN Trans AS t ON t.Employee = e.EmpShortID 
    GROUP BY e.EmployeeID, e.EmpShortID 
) AS m 
INNER JOIN Trans AS tm ON 
m.EmpShortID = tm.Employee AND 
m.MaxTransDate = tm.TransDate 
WHERE tm.ExecutionFlag = 0 

Answer 2

非常简单的查询。假定dbo架构：

SELECT TOP 1 * 
FROM dbo.Transaction T 
INNER JOIN dbo.Employee E 
ON T.Employee = E.EmpshortID 
WHERE T.ExecutionFlag = 0 
ORDER BY T.TransDate DESC 

请参阅SQLFiddle

编辑：改变每个员工：

SELECT * 
FROM dbo.Transaction T 
INNER JOIN dbo.Employee E 
ON T.Employee = E.EmpshortID 
WHERE T.ExecutionFlag = 0 
ORDER BY T.TransDate DESC 

Answer 3

SELECT TOP 1 
    * 
FROM Employee AS emp 
INNER JOIN Transaction AS tran 
    ON tran.Employee = emp.EmpShortID 
WHERE tran.ExecutionFlag = 0 
ORDER BY TransDate DESC 

Answer 4

事端这样呢？

Select top1 from Employee, Transaction 
    where Employee.EmployeeID = Transaction.EmployeeID 
    and ExecutionFlag=0 
    order by TransDate desc;