在Oracle中选择最近日期的缺失记录

Question

我有两个只有3个公共字段的表。 我写了下面的查询回暖与最新的日期丢失的数据如表1

Employee Category Date_Field First_Name Last_Name Status Result 
100  Type1 30/08/2010 A   B   Present Good 
200  Type1 1/09/2010 C   D   Hello Alt 
100  Type3 30/09/2010 A   B 
100  Type1 30/09/2012 A   B 


Employee Category Date_Field 
100  Type1  03/11/2016 
100  Type3  30/09/2010 
100  Type4  11/10/2010 
200  Type3  12/12/1989 

我的查询是

with x1 as (SELECT Employee,Category,Date_Field,First_Name,Last_Name,Status,Result,' ' as Somefield from table 1 
where not exists 

(select 1 from table2 
where table1.employee=table2.employee and table1.category = table2.Category 
and table1.Date_Field = table2.Date_Field)), 

x2 as (select Employee,Category,Max(Date_Field) as DateField from x1 group by Employee) 

select x1.Employee,x1.Category,x1.Date_Field,x1.First_Name,x1.Last_Name,x1.Status,x1.Result,x1.Somefield from x1,x2 
where x1.Employee = x2.Employee and x1.Date_Field=x2.DateField and x1.Category=x2.Category 
order by x1.Employee; 

的电流Ouptput我得到的是

Employee Category Date_Field First_Name Last_Name Status Result 
100  Type1  30/09/2012 A   B 
200  Type1  1/09/2010 C   D  Hello Alt 

灿我得到这个查询修改，以便如果在表2中有最新日期和类别的同一雇员的记录，我的输出不应该有该记录。

所以预期输出是

Employee Category Date_Field First_Name Last_Name Status Result 
200  Type1 1/09/2010 C   D   Hello Alt 

你的帮助是非常赞赏

Answer 1

希望你能忽略了NOT EXISTS子句中的DateField。

SELECT * FROM TABLE1 T1 
WHERE NOT EXISTS 
(
    SELECT 'x' FROM TABLE2 T2 
    WHERE T1.EMPLOYEE = T2.EMPLOYEE 
    AND T1.CATEGORY = T2.CATEGORY 
    AND T2.DATEFIELD >= T1.DATEFIELD 
)