如何将某些概念性 类 的值与 SQL 相加？
How do I aggregate values respect to some conceptual classes with SQL?
我想解决的问题是class化一些值以通过SQL提取一些知识。
它要提出的sql解决方案可以应用于由少数classes
组成的class化系统
我们将考虑一个简单的案例，通过分层排序进行聚合。特别是，我们的 classification
系统会由若干个class组成，每一个都会对应一定天数的class
小于不同的数量。
class的数量应该非常有限。
例如：class由所有小于七的天组成，class由所有小于六的天组成，
class 由小于五的所有天组成，依此类推...
我的灵感来自一个关于堆栈溢出的问题.. Aggregation of Data
我们要使用的sql是在mysql dbms上实现的版本。
对于答案中报告的示例，您可以使用 SQL Fiddle: http://sqlfiddle.com
基于 SQL
中的 class化系统的价值聚合
为了解决这类问题，在我们的问题中定义了约束，我们可以开始考虑我们的
class化系统将包含一些 table 记录，代表我们将考虑的 classes
执行我们的计算，我们的参考系统。
我们的目标是根据我们的 classes 计算一些值，对于每个 class 我们想知道某事的百分比..
那么，让我们创建 table 个 classes..
Table"Classes"的问题。
Class Reference_Score
----------------------------
1 1800
3 1800
5 1800
7 1800
此 table 的每条记录表示小于字段值 "Class":
的所有值的 class
..然后是我们的 "Scores"
some_order order_score
--------------------------
1 90
3 80
4 560
6 980
7 1050
ok..我们想知道每个 class 的百分比分数，即所有分数总和的关系
属于class，分数分配给class，我们的参考分数：
percentage_score = ( SUM(order_score)/Reference_Score ) * 100
ok开始吧..（后面的sql是MySqldbms的实现）
1. the first thing is to assign flags to each value of our scores by order:
select
Scores.some_order, Scores.order_score,
case when Scores.some_order <= 7 then '1_7' else '' end seven,
case when Scores.some_order <= 6 then '1_6' else '' end six,
case when Scores.some_order <= 5 then '1_5' else '' end five,
case when Scores.some_order <= 4 then '1_4' else '' end four,
case when Scores.some_order <= 3 then '1_3' else '' end three,
case when Scores.some_order <= 2 then '1_2' else '' end two,
case when Scores.some_order <= 1 then '1_1' else '' end one
FROM Scores
this is the result:
| some_order | order_score | seven | six | five | four | three | two | one |
|------------|-------------|-------|-----|------|------|-------|-----|-----|
| 1 | 90 | 1_7 | 1_6 | 1_5 | 1_4 | 1_3 | 1_2 | 1_1 |
| 3 | 80 | 1_7 | 1_6 | 1_5 | 1_4 | 1_3 | | |
| 4 | 560 | 1_7 | 1_6 | 1_5 | 1_4 | | | |
| 6 | 980 | 1_7 | 1_6 | | | | | |
| 7 | 1050 | 1_7 | | | | | | |
----------------------------------------------------------------------------
2. now, we can start to calculate the sum of each score and put this sum in computed field, each of whom represents a class of our problem, and the table records we'll get out, represent the score by omogeneous class:
select
case when Scores_Flagged.seven = '1_7' then sum(Scores_Flagged.order_score) else 0 end tot_seven,
case when Scores_Flagged.six = '1_6' then sum(Scores_Flagged.order_score) else 0 end tot_six,
case when Scores_Flagged.five = '1_5' then sum(Scores_Flagged.order_score) else 0 end tot_five,
case when Scores_Flagged.four = '1_4' then sum(Scores_Flagged.order_score) else 0 end tot_four,
case when Scores_Flagged.three = '1_3' then sum(Scores_Flagged.order_score) else 0 end tot_three,
case when Scores_Flagged.two = '1_2' then sum(Scores_Flagged.order_score) else 0 end tot_two,
case when Scores_Flagged.one = '1_1' then sum(Scores_Flagged.order_score) else 0 end tot_one
from
(
select
Scores.some_order, Scores.order_score,
case when Scores.some_order <= 7 then '1_7' else '' end seven,
case when Scores.some_order <= 6 then '1_6' else '' end six,
case when Scores.some_order <= 5 then '1_5' else '' end five,
case when Scores.some_order <= 4 then '1_4' else '' end four,
case when Scores.some_order <= 3 then '1_3' else '' end three,
case when Scores.some_order <= 2 then '1_2' else '' end two,
case when Scores.some_order <= 1 then '1_1' else '' end one
FROM Scores
) Scores_Flagged
group by seven, six, five, four, three, two, one
| tot_seven | tot_six | tot_five | tot_four | tot_three | tot_two | tot_one |
|-----------|---------|----------|----------|-----------|---------|---------|
| 1050 | 0 | 0 | 0 | 0 | 0 | 0 |
| 980 | 980 | 0 | 0 | 0 | 0 | 0 |
| 560 | 560 | 560 | 560 | 0 | 0 | 0 |
| 80 | 80 | 80 | 80 | 80 | 0 | 0 |
| 90 | 90 | 90 | 90 | 90 | 90 | 90 |
-----------------------------------------------------------------------------
3. at this point, let'get the total scores for omogeneous classes, who they will be the basis of our compute:
select
sum(Scores_by_Omogeneous_Classes.tot_seven) tot_seven,
sum(Scores_by_Omogeneous_Classes.tot_six) tot_six,
sum(Scores_by_Omogeneous_Classes.tot_five) tot_five,
sum(Scores_by_Omogeneous_Classes.tot_four) tot_four,
sum(Scores_by_Omogeneous_Classes.tot_three) tot_three,
sum(Scores_by_Omogeneous_Classes.tot_two) tot_two,
sum(Scores_by_Omogeneous_Classes.tot_one) tot_one
from
(
select
case when Scores_Flagged.seven = '1_7' then sum(Scores_Flagged.order_score) else 0 end tot_seven,
case when Scores_Flagged.six = '1_6' then sum(Scores_Flagged.order_score) else 0 end tot_six,
case when Scores_Flagged.five = '1_5' then sum(Scores_Flagged.order_score) else 0 end tot_five,
case when Scores_Flagged.four = '1_4' then sum(Scores_Flagged.order_score) else 0 end tot_four,
case when Scores_Flagged.three = '1_3' then sum(Scores_Flagged.order_score) else 0 end tot_three,
case when Scores_Flagged.two = '1_2' then sum(Scores_Flagged.order_score) else 0 end tot_two,
case when Scores_Flagged.one = '1_1' then sum(Scores_Flagged.order_score) else 0 end tot_one
from
(
select
Scores.some_order, Scores.order_score,
case when Scores.some_order <= 7 then '1_7' else '' end seven,
case when Scores.some_order <= 6 then '1_6' else '' end six,
case when Scores.some_order <= 5 then '1_5' else '' end five,
case when Scores.some_order <= 4 then '1_4' else '' end four,
case when Scores.some_order <= 3 then '1_3' else '' end three,
case when Scores.some_order <= 2 then '1_2' else '' end two,
case when Scores.some_order <= 1 then '1_1' else '' end one
FROM Scores
) Scores_Flagged
group by seven, six, five, four, three, two, one
)Scores_by_Omogeneous_Classes
| tot_seven | tot_six | tot_five | tot_four | tot_three | tot_two | tot_one |
|-----------|---------|----------|----------|-----------|---------|---------|
| 2760 | 1710 | 730 | 730 | 170 | 90 | 90 |
-----------------------------------------------------------------------------
4. and finally, let's evaluate our intedend value (in this case a percentage) by each class::
select
Classes.Class,
case
when Classes.Class = 7
then cast((Total_Scores_by_Omogeneous_Classes.tot_seven/Classes.Reference_Score) * 100 as decimal(5,2))
when Classes.Class = 6
then cast((Total_Scores_by_Omogeneous_Classes.tot_six/Classes.Reference_Score) * 100 as decimal(5,2))
when Classes.Class = 5
then cast((Total_Scores_by_Omogeneous_Classes.tot_five/Classes.Reference_Score) * 100 as decimal(5,2))
when Classes.Class = 4
then cast((Total_Scores_by_Omogeneous_Classes.tot_four/Classes.Reference_Score) * 100 as decimal(5,2))
when Classes.Class = 3
then cast((Total_Scores_by_Omogeneous_Classes.tot_three/Classes.Reference_Score) * 100 as decimal(5,2))
when Classes.Class = 2
then cast((Total_Scores_by_Omogeneous_Classes.tot_two/Classes.Reference_Score) * 100 as decimal(5,2))
when Classes.Class = 1
then cast((Total_Scores_by_Omogeneous_Classes.tot_one/Classes.Reference_Score) * 100 as decimal(5,2))
else 0
end Percentage_Score
from Classes
inner join
(
select
sum(Scores_by_Omogeneous_Classes.tot_seven) tot_seven,
sum(Scores_by_Omogeneous_Classes.tot_six) tot_six,
sum(Scores_by_Omogeneous_Classes.tot_five) tot_five,
sum(Scores_by_Omogeneous_Classes.tot_four) tot_four,
sum(Scores_by_Omogeneous_Classes.tot_three) tot_three,
sum(Scores_by_Omogeneous_Classes.tot_two) tot_two,
sum(Scores_by_Omogeneous_Classes.tot_one) tot_one
from
(
select
case when Scores_Flagged.seven = '1_7' then sum(Scores_Flagged.order_score) else 0 end tot_seven,
case when Scores_Flagged.six = '1_6' then sum(Scores_Flagged.order_score) else 0 end tot_six,
case when Scores_Flagged.five = '1_5' then sum(Scores_Flagged.order_score) else 0 end tot_five,
case when Scores_Flagged.four = '1_4' then sum(Scores_Flagged.order_score) else 0 end tot_four,
case when Scores_Flagged.three = '1_3' then sum(Scores_Flagged.order_score) else 0 end tot_three,
case when Scores_Flagged.two = '1_2' then sum(Scores_Flagged.order_score) else 0 end tot_two,
case when Scores_Flagged.one = '1_1' then sum(Scores_Flagged.order_score) else 0 end tot_one
from
(
select
Scores.some_order, Scores.order_score,
case when Scores.some_order <= 7 then '1_7' else '' end seven,
case when Scores.some_order <= 6 then '1_6' else '' end six,
case when Scores.some_order <= 5 then '1_5' else '' end five,
case when Scores.some_order <= 4 then '1_4' else '' end four,
case when Scores.some_order <= 3 then '1_3' else '' end three,
case when Scores.some_order <= 2 then '1_2' else '' end two,
case when Scores.some_order <= 1 then '1_1' else '' end one
FROM Scores
) Scores_Flagged
group by seven, six, five, four, three, two, one
)Scores_by_Omogeneous_Classes
) Total_Scores_by_Omogeneous_Classes
5. We have our attended result:
| Class | Percentage_Score |
|-------|------------------|
| 1 | 5 |
| 3 | 9.44 |
| 5 | 40.56 |
| 7 | 153.33 |
----------------------------
We can also add multiple reference scores for the same classes, and so can have several percentages related upon more reference scores:
for example:
Class Reference_Score
----------------------------
1 1800
3 1800
5 1800
7 1800
1 3600
3 3600
5 3600
7 3600
--------------------------
| Class | Percentage_Score |
|-------|------------------|
| 1 | 5 |
| 3 | 9.44 |
| 5 | 40.56 |
| 7 | 153.33 |
| 1 | 2.5 |
| 3 | 4.72 |
| 5 | 20.28 |
| 7 | 76.67 |
----------------------------
我想解决的问题是class化一些值以通过SQL提取一些知识。
它要提出的sql解决方案可以应用于由少数classes
组成的class化系统我们将考虑一个简单的案例，通过分层排序进行聚合。特别是，我们的 classification 系统会由若干个class组成，每一个都会对应一定天数的class 小于不同的数量。
class的数量应该非常有限。
例如：class由所有小于七的天组成，class由所有小于六的天组成， class 由小于五的所有天组成，依此类推...
我的灵感来自一个关于堆栈溢出的问题.. Aggregation of Data
我们要使用的sql是在mysql dbms上实现的版本。 对于答案中报告的示例，您可以使用 SQL Fiddle: http://sqlfiddle.com
基于 SQL
中的 class化系统的价值聚合为了解决这类问题，在我们的问题中定义了约束，我们可以开始考虑我们的 class化系统将包含一些 table 记录，代表我们将考虑的 classes 执行我们的计算，我们的参考系统。
我们的目标是根据我们的 classes 计算一些值，对于每个 class 我们想知道某事的百分比..
那么，让我们创建 table 个 classes..
Table"Classes"的问题。
Class Reference_Score
----------------------------
1 1800
3 1800
5 1800
7 1800
此 table 的每条记录表示小于字段值 "Class":
的所有值的 class..然后是我们的 "Scores"
some_order order_score
--------------------------
1 90
3 80
4 560
6 980
7 1050
ok..我们想知道每个 class 的百分比分数，即所有分数总和的关系 属于class，分数分配给class，我们的参考分数：
percentage_score = ( SUM(order_score)/Reference_Score ) * 100
ok开始吧..（后面的sql是MySqldbms的实现）
1. the first thing is to assign flags to each value of our scores by order:
select
Scores.some_order, Scores.order_score,
case when Scores.some_order <= 7 then '1_7' else '' end seven,
case when Scores.some_order <= 6 then '1_6' else '' end six,
case when Scores.some_order <= 5 then '1_5' else '' end five,
case when Scores.some_order <= 4 then '1_4' else '' end four,
case when Scores.some_order <= 3 then '1_3' else '' end three,
case when Scores.some_order <= 2 then '1_2' else '' end two,
case when Scores.some_order <= 1 then '1_1' else '' end one
FROM Scores
this is the result:
| some_order | order_score | seven | six | five | four | three | two | one |
|------------|-------------|-------|-----|------|------|-------|-----|-----|
| 1 | 90 | 1_7 | 1_6 | 1_5 | 1_4 | 1_3 | 1_2 | 1_1 |
| 3 | 80 | 1_7 | 1_6 | 1_5 | 1_4 | 1_3 | | |
| 4 | 560 | 1_7 | 1_6 | 1_5 | 1_4 | | | |
| 6 | 980 | 1_7 | 1_6 | | | | | |
| 7 | 1050 | 1_7 | | | | | | |
----------------------------------------------------------------------------
2. now, we can start to calculate the sum of each score and put this sum in computed field, each of whom represents a class of our problem, and the table records we'll get out, represent the score by omogeneous class:
select
case when Scores_Flagged.seven = '1_7' then sum(Scores_Flagged.order_score) else 0 end tot_seven,
case when Scores_Flagged.six = '1_6' then sum(Scores_Flagged.order_score) else 0 end tot_six,
case when Scores_Flagged.five = '1_5' then sum(Scores_Flagged.order_score) else 0 end tot_five,
case when Scores_Flagged.four = '1_4' then sum(Scores_Flagged.order_score) else 0 end tot_four,
case when Scores_Flagged.three = '1_3' then sum(Scores_Flagged.order_score) else 0 end tot_three,
case when Scores_Flagged.two = '1_2' then sum(Scores_Flagged.order_score) else 0 end tot_two,
case when Scores_Flagged.one = '1_1' then sum(Scores_Flagged.order_score) else 0 end tot_one
from
(
select
Scores.some_order, Scores.order_score,
case when Scores.some_order <= 7 then '1_7' else '' end seven,
case when Scores.some_order <= 6 then '1_6' else '' end six,
case when Scores.some_order <= 5 then '1_5' else '' end five,
case when Scores.some_order <= 4 then '1_4' else '' end four,
case when Scores.some_order <= 3 then '1_3' else '' end three,
case when Scores.some_order <= 2 then '1_2' else '' end two,
case when Scores.some_order <= 1 then '1_1' else '' end one
FROM Scores
) Scores_Flagged
group by seven, six, five, four, three, two, one
| tot_seven | tot_six | tot_five | tot_four | tot_three | tot_two | tot_one |
|-----------|---------|----------|----------|-----------|---------|---------|
| 1050 | 0 | 0 | 0 | 0 | 0 | 0 |
| 980 | 980 | 0 | 0 | 0 | 0 | 0 |
| 560 | 560 | 560 | 560 | 0 | 0 | 0 |
| 80 | 80 | 80 | 80 | 80 | 0 | 0 |
| 90 | 90 | 90 | 90 | 90 | 90 | 90 |
-----------------------------------------------------------------------------
3. at this point, let'get the total scores for omogeneous classes, who they will be the basis of our compute:
select
sum(Scores_by_Omogeneous_Classes.tot_seven) tot_seven,
sum(Scores_by_Omogeneous_Classes.tot_six) tot_six,
sum(Scores_by_Omogeneous_Classes.tot_five) tot_five,
sum(Scores_by_Omogeneous_Classes.tot_four) tot_four,
sum(Scores_by_Omogeneous_Classes.tot_three) tot_three,
sum(Scores_by_Omogeneous_Classes.tot_two) tot_two,
sum(Scores_by_Omogeneous_Classes.tot_one) tot_one
from
(
select
case when Scores_Flagged.seven = '1_7' then sum(Scores_Flagged.order_score) else 0 end tot_seven,
case when Scores_Flagged.six = '1_6' then sum(Scores_Flagged.order_score) else 0 end tot_six,
case when Scores_Flagged.five = '1_5' then sum(Scores_Flagged.order_score) else 0 end tot_five,
case when Scores_Flagged.four = '1_4' then sum(Scores_Flagged.order_score) else 0 end tot_four,
case when Scores_Flagged.three = '1_3' then sum(Scores_Flagged.order_score) else 0 end tot_three,
case when Scores_Flagged.two = '1_2' then sum(Scores_Flagged.order_score) else 0 end tot_two,
case when Scores_Flagged.one = '1_1' then sum(Scores_Flagged.order_score) else 0 end tot_one
from
(
select
Scores.some_order, Scores.order_score,
case when Scores.some_order <= 7 then '1_7' else '' end seven,
case when Scores.some_order <= 6 then '1_6' else '' end six,
case when Scores.some_order <= 5 then '1_5' else '' end five,
case when Scores.some_order <= 4 then '1_4' else '' end four,
case when Scores.some_order <= 3 then '1_3' else '' end three,
case when Scores.some_order <= 2 then '1_2' else '' end two,
case when Scores.some_order <= 1 then '1_1' else '' end one
FROM Scores
) Scores_Flagged
group by seven, six, five, four, three, two, one
)Scores_by_Omogeneous_Classes
| tot_seven | tot_six | tot_five | tot_four | tot_three | tot_two | tot_one |
|-----------|---------|----------|----------|-----------|---------|---------|
| 2760 | 1710 | 730 | 730 | 170 | 90 | 90 |
-----------------------------------------------------------------------------
4. and finally, let's evaluate our intedend value (in this case a percentage) by each class::
select
Classes.Class,
case
when Classes.Class = 7
then cast((Total_Scores_by_Omogeneous_Classes.tot_seven/Classes.Reference_Score) * 100 as decimal(5,2))
when Classes.Class = 6
then cast((Total_Scores_by_Omogeneous_Classes.tot_six/Classes.Reference_Score) * 100 as decimal(5,2))
when Classes.Class = 5
then cast((Total_Scores_by_Omogeneous_Classes.tot_five/Classes.Reference_Score) * 100 as decimal(5,2))
when Classes.Class = 4
then cast((Total_Scores_by_Omogeneous_Classes.tot_four/Classes.Reference_Score) * 100 as decimal(5,2))
when Classes.Class = 3
then cast((Total_Scores_by_Omogeneous_Classes.tot_three/Classes.Reference_Score) * 100 as decimal(5,2))
when Classes.Class = 2
then cast((Total_Scores_by_Omogeneous_Classes.tot_two/Classes.Reference_Score) * 100 as decimal(5,2))
when Classes.Class = 1
then cast((Total_Scores_by_Omogeneous_Classes.tot_one/Classes.Reference_Score) * 100 as decimal(5,2))
else 0
end Percentage_Score
from Classes
inner join
(
select
sum(Scores_by_Omogeneous_Classes.tot_seven) tot_seven,
sum(Scores_by_Omogeneous_Classes.tot_six) tot_six,
sum(Scores_by_Omogeneous_Classes.tot_five) tot_five,
sum(Scores_by_Omogeneous_Classes.tot_four) tot_four,
sum(Scores_by_Omogeneous_Classes.tot_three) tot_three,
sum(Scores_by_Omogeneous_Classes.tot_two) tot_two,
sum(Scores_by_Omogeneous_Classes.tot_one) tot_one
from
(
select
case when Scores_Flagged.seven = '1_7' then sum(Scores_Flagged.order_score) else 0 end tot_seven,
case when Scores_Flagged.six = '1_6' then sum(Scores_Flagged.order_score) else 0 end tot_six,
case when Scores_Flagged.five = '1_5' then sum(Scores_Flagged.order_score) else 0 end tot_five,
case when Scores_Flagged.four = '1_4' then sum(Scores_Flagged.order_score) else 0 end tot_four,
case when Scores_Flagged.three = '1_3' then sum(Scores_Flagged.order_score) else 0 end tot_three,
case when Scores_Flagged.two = '1_2' then sum(Scores_Flagged.order_score) else 0 end tot_two,
case when Scores_Flagged.one = '1_1' then sum(Scores_Flagged.order_score) else 0 end tot_one
from
(
select
Scores.some_order, Scores.order_score,
case when Scores.some_order <= 7 then '1_7' else '' end seven,
case when Scores.some_order <= 6 then '1_6' else '' end six,
case when Scores.some_order <= 5 then '1_5' else '' end five,
case when Scores.some_order <= 4 then '1_4' else '' end four,
case when Scores.some_order <= 3 then '1_3' else '' end three,
case when Scores.some_order <= 2 then '1_2' else '' end two,
case when Scores.some_order <= 1 then '1_1' else '' end one
FROM Scores
) Scores_Flagged
group by seven, six, five, four, three, two, one
)Scores_by_Omogeneous_Classes
) Total_Scores_by_Omogeneous_Classes
5. We have our attended result:
| Class | Percentage_Score |
|-------|------------------|
| 1 | 5 |
| 3 | 9.44 |
| 5 | 40.56 |
| 7 | 153.33 |
----------------------------
We can also add multiple reference scores for the same classes, and so can have several percentages related upon more reference scores:
for example:
Class Reference_Score
----------------------------
1 1800
3 1800
5 1800
7 1800
1 3600
3 3600
5 3600
7 3600
--------------------------
| Class | Percentage_Score |
|-------|------------------|
| 1 | 5 |
| 3 | 9.44 |
| 5 | 40.56 |
| 7 | 153.33 |
| 1 | 2.5 |
| 3 | 4.72 |
| 5 | 20.28 |
| 7 | 76.67 |
----------------------------