Question

我正在运行SQL Server 2012，并且我的数据库中有一个名为DateDimension的表。我的DateDimension表是一个包含2列的表：列date包含每天从'2014-01-01'到'2019-12-31'的日期，列WeekGroup是{ {1}}数据类型。

摘录如下：

nvarchar(100)

我现在有以下查询：

date         WeekGroup
2014-01-01   Wk 30 Dec 2013-05 Jan 2014
2014-01-02   Wk 30 Dec 2013-05 Jan 2014
2014-01-03   Wk 30 Dec 2013-05 Jan 2014
2014-01-04   Wk 30 Dec 2013-05 Jan 2014
2014-01-05   Wk 30 Dec 2013-05 Jan 2014
2014-01-06   Wk 06 Jan 2014-12 Jan 2014
...

我的输出如下：

SELECT
[date],
[WeekGroup],
RANK() OVER (ORDER BY [date] ASC) AS 'Rank'

FROM DateDimension

WHERE date BETWEEN '2014-01-01' AND '2019-12-31'

ORDER BY [date] ASC

我想对上面的查询进行微调，以便获得以下输出，其中包含date WeekGroup Rank 2014-01-01 Wk 30 Dec 2013-05 Jan 2014 1 2014-01-02 Wk 30 Dec 2013-05 Jan 2014 2 2014-01-03 Wk 30 Dec 2013-05 Jan 2014 3 2014-01-04 Wk 30 Dec 2013-05 Jan 2014 4 2014-01-05 Wk 30 Dec 2013-05 Jan 2014 5 2014-01-06 Wk 06 Jan 2014-12 Jan 2014 6 ... distinct和相应的WeekGroup：

Rank

如何在WeekGroup Rank Wk 30 Dec 2013-05 Jan 2014 1 Wk 06 Jan 2014-12 Jan 2014 2 ...变量（nvarchar）上执行此操作？

Answer 1

按周分组保留date并进行汇总：

SELECT WeekGroup,
       RANK() OVER (ORDER BY MIN([date]) ASC) AS [Rank]
FROM DateDimension
WHERE date BETWEEN '2014-01-01' AND '2019-12-31'
GROUP BY WeekGroup
ORDER BY MIN([date]) ASC;

Answer 2

这使用CTE和RANK（）：

declare @DateDimension table ([date] date, WeekGroup nvarchar(100))
insert into @DateDimension values
  ('2014-01-01', 'Wk 30 Dec 2013-05 Jan 2014')
, ('2014-01-02', 'Wk 30 Dec 2013-05 Jan 2014')
, ('2014-01-03', 'Wk 30 Dec 2013-05 Jan 2014')
, ('2014-01-04', 'Wk 30 Dec 2013-05 Jan 2014')
, ('2014-01-05', 'Wk 30 Dec 2013-05 Jan 2014')
, ('2014-01-06', 'Wk 06 Jan 2014-12 Jan 2014')

;with cte as (
SELECT [WeekGroup], count(*) as count
FROM @DateDimension
WHERE date BETWEEN '2014-01-01' AND '2019-12-31'
group by [WeekGroup])
select [WeekGroup], rank() over (order by [count] desc) as [Rank] from cte

Answer 3

尝试一下。

   declare @DatA table ([date] date, WeekGroup nvarchar(100))
    insert into @DatA values
      ('2014-01-01', 'Wk 30 Dec 2013-05 Jan 2014')
    , ('2014-01-02', 'Wk 30 Dec 2013-05 Jan 2014')
    , ('2014-01-03', 'Wk 30 Dec 2013-05 Jan 2014')
    , ('2014-01-04', 'Wk 30 Dec 2013-05 Jan 2014')
    , ('2014-01-05', 'Wk 30 Dec 2013-05 Jan 2014')
    , ('2014-01-06', 'Wk 06 Jan 2014-12 Jan 2014')
    SELECT WEEKGROUP, RANK() OVER (ORDER BY A.WeekGroup desc) RNK
    FROM (
              SELECT DISTINCT WEEKGROUP FROM @DatA
              WHERE date BETWEEN '2014-01-01' AND '2019-12-31'
         )A

在这种情况下，如何选择nvarchar数据类型的不同值并为其赋予等级？

3 个答案: