您需要使用一个子查询，该子查询为每个RefId提取最新的Entered值，然后将您的源表与此RefId一起输入，输入:

You need to use a subquery that extracts the latest Entered value for each RefId, and then join your source table to this on RefId, Entered:

SELECT DISTINCT MyTable.LogId, MyTable.Entered FROM MyTable
INNER JOIN (SELECT RefId, MAX(Entered) as Entered FROM MyTable GROUP BY RefId) Latest
ON MyTable.RefId = Latest.RefId AND MyTable.Entered = Latest.Entered