Question

我在SQL Server 2008数据库中有一个表，我想在1到10的范围内安排一个数字列。

这是一个示例，其中列（Scale）是我想用SQL

完成的

Name    Count   (Scale)
----------------------
A       19      2       
B       1       1
C       25      3
D       100     10
E       29      3
F       60      7

在上面的例子中，最小和最大计数是1和100（这可能每天都不同）。

我想得到每个记录所属的数字。

1 = 0-9
2 = 10-19
3 = 20-29 and so on...

它必须是动态的，因为这些数据每天都在变化，所以我不能使用WHERE子句和静态数字，如下所示：WHEN Count Between 0 and 10...

Answer 1

您可以将Scale列PERSISTED COMPUTED列设为：

alter table test drop column Scale

ALTER TABLE test ADD
Scale AS (case when Count between 0 and 9 then 1 
               when Count between 10 and 19 then 2
               when Count between 20 and 29 then 3
               when Count between 30 and 39 then 4
               when Count between 40 and 49 then 5 
               when Count between 50 and 59 then 6
               when Count between 60 and 69 then 7
               when Count between 70 and 79 then 8 
               when Count between 80 and 89 then 9
               when Count between 90 and 100 then 10
          end
          )PERSISTED
GO

DEMO

Answer 2

尝试这一点，虽然从技术上讲，值100不会落在90-99的范围内，因此应该被归类为11，因此为什么值60的比例为6而不是7：

SQL Fiddle

MS SQL Server 2008架构设置：

查询1 ：

create table #scale
(
    Name Varchar(10),
    [Count] INT
)

INSERT INTO #scale
VALUES
    ('A', 19),
    ('B', 1),
    ('C', 25),
    ('D', 100),
    ('E', 29),
    ('F', 60)


SELECT name, [COUNT],  
    CEILING([COUNT] * 10.0 / (SELECT MAX([Count])  - MIN([Count]) + 1 FROM #Scale)) AS [Scale]
FROM #scale

<强> Results ：

| NAME | COUNT | SCALE |
|------|-------|-------|
|    A |    19 |     2 |
|    B |     1 |     1 |
|    C |    25 |     3 |
|    D |   100 |    10 |
|    E |    29 |     3 |
|    F |    60 |     6 |

这可以让你得到答案，其中60变为7，因此100是11：

SELECT name, [COUNT],  
    CEILING([COUNT] * 10.0 / (SELECT MAX([Count])  - MIN([Count]) FROM #Scale)) AS [Scale]
FROM #scale

Answer 3

select ntile(10) over (order by [count])

Answer 4

WITH MinMax(Min, Max) AS (SELECT MIN(Count), MAX(Count) FROM Table1)
SELECT Name, Count, 1 + 9 * (Count - Min) / (Max - Min) AS Scale
FROM Table1, MinMax

SQL：按1到10的比例排列数字

4 个答案: