如何仅返回基于日期的最近记录

Question

我需要让我的查询返回仅基于员工开始日期的最新记录。我想我需要一个最大日期内连接，但我无法让它工作。有人对我有任何建议吗？我正在使用TOAD for SQL Developer。

SELECT 
    e.No_, 
    ep.[Classification Description], 
    ep.[Employee Starting Date], 
    ep.[Standard Rate], 
    ep.[Over Award Rate], 
    ep.[Employee Rate], 
    p.[Job Title], 
    e.[First Name], 
    e.[Last Name], 
    e.[Payroll No_] 
FROM Employee e, 
    [Payroll Employee] p, 
    [Employee Pay Rate] ep 
WHERE e.No_ = p.[Employee No_] 
AND e.No_ = ep.[Employee No_] 
AND ep.[Employee No_] = p.[Employee No_] 
AND e.[Payroll No_] = 'PAY7' 
AND CAST(e.[Termination Date] AS date) = '1753-01-01' 

Answer 1

您可以通过做群组，并获得最小或最大日期如下：

SELECT 
    e.No_, 
    ep.[Classification Description], 
    MAX(ep.[Employee Starting Date]) as [Employee Starting Date], --hope it is min based on your logic 
    ep.[Standard Rate], 
    ep.[Over Award Rate], 
    ep.[Employee Rate], 
    p.[Job Title], 
    e.[First Name], 
    e.[Last Name], 
    e.[Payroll No_] 
FROM Employee e 
    INNER JOIN [Payroll Employee] p 
    ON e.No_ = p.[Employee No_] 
    INNER JOIN [Employee Pay Rate] ep 
    ON e.No_ = ep.[Employee No_] 
    AND ep.[Employee No_] = p.[Employee No_] 
WHERE 
    e.[Payroll No_] = 'PAY7' 
AND CAST(e.[Termination Date] AS date) = '1753-01-01' 
GROUP BY 
    e.No_, 
    ep.[Classification Description], 
    ep.[Standard Rate], 
    ep.[Over Award Rate], 
    ep.[Employee Rate], 
    p.[Job Title], 
    e.[First Name], 
    e.[Last Name], 
    e.[Payroll No_]