在SQL Server 数据库中，有关下列T-SQL语句的功能，说法正确的是（  ）。 DECLARE @I int, @J int SET @I=0  WHILE (@I 0)         UPDATE stuMarks SET writtenExam=writtenExam+5 WHERE writtenExam<60      ELSE        BREAK       SET @I = @I + 1    END  SELECT stuNo,成绩=CASE                      WHEN writtenExam<60 THEN '不及格'                     ELSE '及格'                    END     FROM stuMarks