您可以尝试类似
SELECT a.*
FROM TableA a INNER JOIN
(
SELECT tableBID,
MAX(grade) MaxGrade
FROM TableA
GROUP BY tableBID
) B ON a.tableBID = B.tableBID AND a.grade = B.MaxGrade
使用sql Server 2005 ROW_NUMBER函数，您也可以尝试
SELECT tableAID,
tableBID,
grade
FROM (
SELECT *,
ROW_NUMBER() OVER (PARTITION BY tableBID ORDER BY grade DESC) RowNum
FROM @TableA
) A
WHERE a.RowNum = 1
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