条纹的增量列
Increment column for streaks
如何使以下结果以黄色突出显示?
基本上我想要一个计算字段,当 VeganOption = 1 时递增 1,当 VeganOption = 0 时为零
我尝试使用以下查询,但使用分区在零后继续递增。我有点卡在这个上面。
SELECT [UniqueId]
,[Meal]
,[VDate]
,[VeganOption]
, row_number() over (partition by [VeganOption] order by [UniqueId])
FROM [Control]
order by [UniqueId]
Table数据:
CREATE TABLE Control
([UniqueId] int, [Meal] varchar(10), [VDate] datetime, [VeganOption] int);
INSERT INTO Control ([UniqueId], [Meal], [VDate], [VeganOption])
VALUES
('1', 'Breakfast',' 2018-08-01 00:00:00', 1),
('2', 'Lunch',' 2018-08-01 00:00:00', 1),
('3', 'Dinner',' 2018-08-01 00:00:00', 1),
('4', 'Breakfast',' 2018-08-02 00:00:00', 1),
('5', 'Lunch',' 2018-08-02 00:00:00', 0),
('6', 'Dinner',' 2018-08-02 00:00:00', 0),
('7', 'Breakfast',' 2018-08-03 00:00:00', 1),
('8', 'Lunch',' 2018-08-03 00:00:00', 1),
('9', 'Dinner',' 2018-08-03 00:00:00', 1),
('10', 'Breakfast',' 2018-08-04 00:00:00', 0),
('11', 'Lunch',' 2018-08-04 00:00:00', 1),
('12', 'Dinner',' 2018-08-04 00:00:00', 1)
;
这适用于 SQL Server 2016+
这是 gaps-and-islands 的变体。
我喜欢用行号的不同来定义条纹。这看起来像
select c.*,
(case when veganoption = 1
then row_number() over (partition by veganoption, seqnum - seqnum_v order by uniqueid)
else 0
end) as veganstreak
from (select c.*,
row_number() over (partition by veganoption order by uniqueid) as seqnum_v,
row_number() over (order by uniqueid) as seqnum
from c
) c;
为什么这行得通有点难以解释。但是,如果您查看子查询的结果,您将看到行号的差异如何定义您想要识别的条纹。剩下的只是应用 row_number()
来枚举膳食。
这里是Rextester.
一种方法是使用 CTE 来定义您的分组,然后对这些进行进一步的 ROW_NUMBER()
,结果是:
WITH Grps AS(
SELECT *,
ROW_NUMBER() OVER (ORDER BY UniqueID ASC) -
ROW_NUMBER() OVER (PARTITION BY VeganOption ORDER BY UniqueID ASC) AS Grp
FROM Control)
SELECT *,
CASE VeganOption WHEN 0 THEN 0 ELSE ROW_NUMBER() OVER (PARTITION BY Grp ORDER BY UniqueID ASC) END
FROM Grps
ORDER BY UniqueId;
您可以使用 SUM
创建子组,然后 ROW_NUMBER
:
WITH cte AS (
SELECT [UniqueId]
,[Meal]
,[VDate]
,[VeganOption]
,sum(CASE WHEN VeganOption = 1 THEN 0 ELSE 1 END)
over (order by [UniqueId]) AS grp --switching 0 <-> 1
FROM [Control]
)
SELECT *,CASE WHEN VeganOption =0 THEN 0
ELSE ROW_NUMBER() OVER(PARTITION BY veganOption, grp ORDER BY [UniqueId])
END AS VeganStreak -- main group and calculated subgroup
FROM cte
order by [UniqueId];
如何使以下结果以黄色突出显示?
基本上我想要一个计算字段,当 VeganOption = 1 时递增 1,当 VeganOption = 0 时为零
我尝试使用以下查询,但使用分区在零后继续递增。我有点卡在这个上面。
SELECT [UniqueId]
,[Meal]
,[VDate]
,[VeganOption]
, row_number() over (partition by [VeganOption] order by [UniqueId])
FROM [Control]
order by [UniqueId]
Table数据:
CREATE TABLE Control
([UniqueId] int, [Meal] varchar(10), [VDate] datetime, [VeganOption] int);
INSERT INTO Control ([UniqueId], [Meal], [VDate], [VeganOption])
VALUES
('1', 'Breakfast',' 2018-08-01 00:00:00', 1),
('2', 'Lunch',' 2018-08-01 00:00:00', 1),
('3', 'Dinner',' 2018-08-01 00:00:00', 1),
('4', 'Breakfast',' 2018-08-02 00:00:00', 1),
('5', 'Lunch',' 2018-08-02 00:00:00', 0),
('6', 'Dinner',' 2018-08-02 00:00:00', 0),
('7', 'Breakfast',' 2018-08-03 00:00:00', 1),
('8', 'Lunch',' 2018-08-03 00:00:00', 1),
('9', 'Dinner',' 2018-08-03 00:00:00', 1),
('10', 'Breakfast',' 2018-08-04 00:00:00', 0),
('11', 'Lunch',' 2018-08-04 00:00:00', 1),
('12', 'Dinner',' 2018-08-04 00:00:00', 1)
;
这适用于 SQL Server 2016+
这是 gaps-and-islands 的变体。
我喜欢用行号的不同来定义条纹。这看起来像
select c.*,
(case when veganoption = 1
then row_number() over (partition by veganoption, seqnum - seqnum_v order by uniqueid)
else 0
end) as veganstreak
from (select c.*,
row_number() over (partition by veganoption order by uniqueid) as seqnum_v,
row_number() over (order by uniqueid) as seqnum
from c
) c;
为什么这行得通有点难以解释。但是,如果您查看子查询的结果,您将看到行号的差异如何定义您想要识别的条纹。剩下的只是应用 row_number()
来枚举膳食。
这里是Rextester.
一种方法是使用 CTE 来定义您的分组,然后对这些进行进一步的 ROW_NUMBER()
,结果是:
WITH Grps AS(
SELECT *,
ROW_NUMBER() OVER (ORDER BY UniqueID ASC) -
ROW_NUMBER() OVER (PARTITION BY VeganOption ORDER BY UniqueID ASC) AS Grp
FROM Control)
SELECT *,
CASE VeganOption WHEN 0 THEN 0 ELSE ROW_NUMBER() OVER (PARTITION BY Grp ORDER BY UniqueID ASC) END
FROM Grps
ORDER BY UniqueId;
您可以使用 SUM
创建子组,然后 ROW_NUMBER
:
WITH cte AS (
SELECT [UniqueId]
,[Meal]
,[VDate]
,[VeganOption]
,sum(CASE WHEN VeganOption = 1 THEN 0 ELSE 1 END)
over (order by [UniqueId]) AS grp --switching 0 <-> 1
FROM [Control]
)
SELECT *,CASE WHEN VeganOption =0 THEN 0
ELSE ROW_NUMBER() OVER(PARTITION BY veganOption, grp ORDER BY [UniqueId])
END AS VeganStreak -- main group and calculated subgroup
FROM cte
order by [UniqueId];