Sql MS Access中的第一个\u值

我有一个DB2查询。谁能帮我用MS Access写下这个查询。表中突出显示的行是预期的输出。多谢各位

SELECT s.Student_ID,
first_value(DT_EFFECTIVE) OVER (PARTITION BY S.Student_ID ORDER BY DT_EFFECTIVE DESC) AS DT_EFFECTIVE, 
first_value(Student_Goal) OVER (PARTITION BY S.Student_ID ORDER BY DT_EFFECTIVE DESC) AS Student_Goal
FROM Student AS S
LEFT JOIN St_Goal AS G ON  s.Student_ID = G.Student_ID
WHERE S.Student_ID = 12345

---

您可以使用相关子查询执行此操作：

SELECT s.Student_ID,
       (SELECT TOP (1) sg2.DT_EFFECTIVE
        FROM St_Goal as sg2
        WHERE sg2.Student_ID = S.Student_ID
        ORDER BY sg2.DT_EFFECTIVE DESC
       ) as DT_EFFECTIVE, 
       (SELECT TOP (1) DT_EFFECTIVE
        FROM St_Goal as sg2
        WHERE sg2.Student_ID = S.Student_ID
        ORDER BY sg2.DT_EFFECTIVE DESC
       ) as Student_Goal
FROM Student AS S
WHERE S.Student_ID = 12345;

---

您不需要在外部查询中引用

St\u Goal

，除非您需要一组重复项。

您可以使用相关子查询执行此操作：

SELECT s.Student_ID,
       (SELECT TOP (1) sg2.DT_EFFECTIVE
        FROM St_Goal as sg2
        WHERE sg2.Student_ID = S.Student_ID
        ORDER BY sg2.DT_EFFECTIVE DESC
       ) as DT_EFFECTIVE, 
       (SELECT TOP (1) DT_EFFECTIVE
        FROM St_Goal as sg2
        WHERE sg2.Student_ID = S.Student_ID
        ORDER BY sg2.DT_EFFECTIVE DESC
       ) as Student_Goal
FROM Student AS S
WHERE S.Student_ID = 12345;

---

您不需要在外部查询中引用

St_Goal

，除非您想要一组重复项。

有一种方法可以使用每组前N个，但这需要一个唯一的标识符字段。查看可能的重复项每个组有一个使用TOP N的方法，但这需要一个唯一标识符字段。审查可能的副本