SQL Group By Top 实现

DECLARE @temp TABLE( id INT, [name] VARCHAR(50), class VARCHAR(50) ) INSERT INTO @temp SELECT 1,'a','A' UNION ALL SELECT 2,'b','C' UNION ALL SELECT 3,'c','B' UNION ALL SELECT 4,'d','C' UNION ALL SELECT 5,'e','B' UNION ALL SELECT 6,'f','A' SELECT * FROM @temp AS _temp WHERE [name] IN ( SELECT TOP 1 [name] FROM @temp WHERE _temp.class=class ORDER BY id DESC ) ORDER BY class