Question

今天下午我有一点'大脑褪色'，所以如果有人可以帮助这个mssql查询，那就太棒了。

我有一个名为'season'的表，有三列（有更多但与示例无关）：seasonId，date，tariffId

SeasonId是一个独特的关键。日期只能有一个的关税，但是关税可以有很多不同的日期。

例如：

seasonId  |  date      |  tariffId
----------------------------------
       1  | 1 jan 2009 |         1
       2  | 2 jan 2009 |         1
       3  | 3 jan 2009 |         2
       4  | 4 jan 2009 |         3
       5  | 5 jan 2009 |         3

我希望查询返回特定关税的日期序列/范围

例如，使用上面的数据，它将返回以下内容：

FromDate  |  ToDate    |  TariffId
-----------------------------------
       1  | Jan 2009 2 | Jan 2009 1
       3  | Jan 2009 3 | Jan 2009 2
       4  | Jan 2009 5 | Jan 2009 3

这可能吗？

修改谢谢你到目前为止的所有答案！我总是惊讶你得到了多少回应！

但是，我的示例数据可能不够复杂，因为关税可以有1个或更多日期范围

seasonId  |  date      |  tariffId
----------------------------------
       1  | 1 jan 2009 |         1
       2  | 2 jan 2009 |         1
       3  | 3 jan 2009 |         2
       4  | 4 jan 2009 |         3
       5  | 5 jan 2009 |         3
       6  | 6 jan 2009 |         1
       7  | 7 jan 2009 |         1
       8  | 8 jan 2009 |         3

会给：

FromDate   |     ToDate  |  TariffId
------------------------------------
1 Jan 2009 | 2 Jan 2009  |         1
3 Jan 2009 | 3 Jan 2009  |         2
4 Jan 2009 | 5 Jan 2009  |         3
6 Jan 2009 | 7 Jan 2009  |         1
8 Jan 2009 | 8 Jan 2009  |         3

想法？

感谢大家对此的帮助！这个网站太棒了！

Answer 1

首先是一些测试数据：

create table seasons (seasonId int primary key
    , "date" datetime not null unique
    , tariffId int not null)

insert into seasons values (1, '2009-01-01', 1)
insert into seasons values (2, '2009-01-02', 1)
insert into seasons values (3, '2009-01-03', 2)
insert into seasons values (4, '2009-01-04', 3)
insert into seasons values (5, '2009-01-05', 3)
insert into seasons values (6, '2009-01-06', 1)
insert into seasons values (7, '2009-01-07', 1)
insert into seasons values (8, '2009-01-08', 3)
-- add a tarrif with a datespan larger than 2
insert into seasons values (9, '2009-01-09', 4)
insert into seasons values (10, '2009-01-10', 4)
insert into seasons values (11, '2009-01-11', 4)

在Dave Barker的回答基础上，在内联视图中添加row_number（），以便我们知道哪个是第一个最小值，这是第二个，等等。（实际上由于日期不能有一个以上的关税，我们不需要按关税分配。）

SELECT MinValues.Seasonid, MinValues.Date, MaxValues.Date, MaxValues.tariffid 
FROM (
    SELECT *, row_number() over (partition by tariffId order by "date") as RN 
      FROM [dbo].[Seasons] tbl1
     WHERE NOT EXISTS (SELECT * 
                         FROM [dbo].[Seasons] tbl2 
                        WHERE tbl1.seasonid - tbl2.seasonid = 1 
                          AND tbl1.tariffId = tbl2.tariffId)) as minValues
JOIN (
     SELECT *, row_number() over (partition by tariffId order by "date") as RN
       FROM [dbo].[Seasons] tbl1
      WHERE NOT EXISTS (SELECT *
                          FROM [dbo].[Seasons] tbl2 
                         WHERE tbl2.seasonid - tbl1.seasonid = 1 
                           AND tbl1.tariffId = tbl2.tariffId)) as maxValues
ON MinValues.TariffId = MaxValues.tariffId
and MinValues.RN = MaxValues.RN
order by MinValues.Date

结果：

1   2009-01-01 00:00:00.000 2009-01-02 00:00:00.000 1
3   2009-01-03 00:00:00.000 2009-01-03 00:00:00.000 2
4   2009-01-04 00:00:00.000 2009-01-05 00:00:00.000 3
6   2009-01-06 00:00:00.000 2009-01-07 00:00:00.000 1
8   2009-01-08 00:00:00.000 2009-01-08 00:00:00.000 3
9   2009-01-09 00:00:00.000 2009-01-11 00:00:00.000 4

Answer 2

SELECT min(date) as FromDate, MAX(date) as ToDate, tarifid
FROM seasons
GROUP BY tarifID

应该这样做。

Answer 3

SELECT min(date) as FromDate,MAX(date) as ToDate, tariffid FROM(
select s.*,ISNULL(
(SELECT MAX(seasonID) FROM seasons s1 WHERE s.tariffid <> s1.tariffid AND s1.seasonID < s.seasonID),0) as ranks from seasons s)r
GROUP BY tariffID,ranks

Answer 4

也许这个？

select min(fromdate) as FromDate, max(todate) as ToDate, tarifid
from (

select min(date) as fromdate, null as todate, tarifid
from seasons
group by tarifid

union

select null, max(date), tarifid
from seasons
group by tarifid

) q
group by tarifid

Answer 5

看起来您发现了tariffId的连续出现，然后在该连续出现中找到Date的最小值和最大值。以下适用于您的样本数据但我怀疑最终加入需要一些调整，因为它感觉很臭。

SELECT MinValues.Seasonid, MinValues.Date, MaxValues.Date, MaxValues.tariffid 
FROM (
    SELECT * 
      FROM [dbo].[Seasons] tbl1
     WHERE NOT EXISTS (SELECT * 
                         FROM [dbo].[Seasons] tbl2 
                        WHERE tbl1.seasonid - tbl2.seasonid = 1 
                          AND tbl1.tariffId = tbl2.tariffId)) as minValues
JOIN (
     SELECT * 
       FROM [dbo].[Seasons] tbl1
      WHERE NOT EXISTS (SELECT *
                          FROM [dbo].[Seasons] tbl2 
                         WHERE tbl2.seasonid - tbl1.seasonid = 1 
                           AND tbl1.tariffId = tbl2.tariffId)) as maxValues
ON MinValues.TariffId = MaxValues.tariffId
AND (MinValues.SeasonId = MaxValues.Seasonid or MinValues.SeasonId +1 = MaxValues.Seasonid)

SQL Server查询以对顺序日期数据进行分组

5 个答案: