Question

我有两张桌子：

表＃1 - 学生：

+------+-------+
|Roll  |  Name |
+------+-------+
|   1  |    A  |
|   2  |    B  |
|   3  |    C  |
+------+-------+

表＃2 - 标记：

+------+------+
| Roll | Mark |
+------+------+
|   1  |  85  |
|   3  |  95  |
+------+------+

输出需要：

+-------+------+-------+---------+
| Roll  | Name | Mark  |Position |
+-------+------+-------+---------+
|   1   |   A  |  85   |    2    |
|   2   |   B  |  0    |    3    |
|   3   |   C  |  95   |    1    |
+-------+------+-------+---------+

获取输出的查询应该是什么？我认为rank函数将被使用，但不知道使用它...

Answer 1

使用LEFT JOIN加入两个表，然后使用RANK()。

<强>查询

select *, Position = rank() over(
    order by t.Mark desc
)
from(
    select t1.Roll, t1.Name, coalesce(t2.Mark, 0) as Mark
    from student t1
    left join Mark t2
    on t1.Roll = t2.Roll
)t
order by t.Name;

Answer 2

使用Left Join和Rank（）函数。

查询

select T1.Roll, T1.Name, isnull(T2.Mark,0) Mark, rank() over(order by mark desc) Position 
from STUDENT T1 left join MARK T2 
on T1.Roll = T2.Roll order by T1.Roll

如何在SQL Server中根据某些数量选择位置

2 个答案: