sqlserver查询数据表中每个分类最新的一条记录

SELECT t1.* 
FROM PKappa t1,
(SELECT CategoryId,
MAX(ExaminationTime) ExaminationTime 
FROM PKappa 
WHERE EmployeeNo='A0086875' 
GROUP BY CategoryId) t2 
WHERE t1.ExaminationTime=t2.ExaminationTime 
AND t1.CategoryId=t2.CategoryId 
AND EmployeeNo='A0086875' AND 
t1.ExaminationTime>='2020-04-16 00:00:00.000' 
ORDER BY CategoryId