Sql 并通过并集将两个结果集合并。根据数据的大小，您可能必须在临时表上使用索引。 +-------+-----------+---------------------+--------+ | RowNo | Name | Date

并通过并集将两个结果集合并。根据数据的大小，您可能必须在临时表上使用索引。

+-------+-----------+---------------------+--------+
| RowNo |   Name    |        Date         | Amount |
+-------+-----------+---------------------+--------+
|     1 | Customer1 | 2018-11-10 01:00:00 | 55.49  |
|     2 | Customer2 | 2018-11-10 02:00:00 | 58.15  |
|     3 | Customer3 | 2018-11-10 03:00:00 | 79.15  |
|     4 | Customer1 | 2018-11-11 04:00:00 | 41.89  |
|     5 | Customer2 | 2018-11-11 05:00:00 | 5.15   |
|     6 | Customer3 | 2018-11-11 06:00:00 | 35.17  |
|     7 | Customer1 | 2018-11-12 07:00:00 | 43.78  |
|     8 | Customer1 | 2018-11-12 08:00:00 | 93.78  |
|     9 | Customer2 | 2018-11-12 09:00:00 | 80.74  |
+-------+-----------+---------------------+--------+

Create view vwReport as
Select c.Name, t.Date, t.Amount 
from Transaction t
inner join Customer c on c.Id = t.CustomerId

Select * from 
vwReport r
where r.Date between '2018-11-10 00:00:00' and '2018-11-11 00:00:00'

select t.*
from transactions t
where t.date = (select max(t2.date)
                from transactions t2
                where t2.name = t.name and
                      t2.date <= @date
               );

select t1.*
from
    vwReport t1 inner join
    (
        select t2.name, max(t2.date) as mdate
        from vwReport t2
        group by t2.name
    ) t3
    on t1.name = t3.name and t1.date = t3.mdate
where
    t1.date <= @date

SELECT * FROM (
    SELECT *, RANK() OVER (PARTITION BY Name ORDER BY CAST(Date AS DATE) DESC) AS rn
    FROM txntbl
    WHERE CAST(Date AS DATE) <= '2018-11-12'
) AS x
WHERE rn = 1

with found as
( 
    select c.Id, c.Name, t.Date, t.Amount 
    from Transaction t
    inner join Customer c on c.Id = t.CustomerId
    where Date between '2018-11-10 00:00:00' and '2018-11-11 00:00:00' 
)
with unfound as
(
    select c.Id, c.Name, t.Date, t.Amount, RANK() OVER (PARTITION BY Name ORDER BY CAST(Date AS DATE) DESC) AS row
    from Transaction t
    inner join Customer c on c.Id = t.CustomerId
    WHERE Date < '2018-11-10 00:00:00'
)
select Name, Date, Amount 
from found
union all
select Name, Date, Amount 
from unfound
where Id not in ( select Id from found ) and row = 1

SELECT * FROM vwReport r
WHERE (r.Date BETWEEN '2018-11-10 00:00:00' AND '2018-11-11 00:00:00')
AND (r.Name = @name)
UNION
SELECT * FROM vwReport r
WHERE (r.Date = (SELECT MAX(r.Date) FROM vwReport r WHERE r.Name = @name))
AND (r.Name = @name)
AND ((SELECT COUNT(*) FROM vwReport r 
    WHERE (r.Date BETWEEN '2018-11-10 00:00:00' AND '2018-11-11 00:00:00') 
    AND (r.Name = @name)) = 0)