我正在使用SQL Server 2008，我正在尝试编写一个将列拆分为单独行的查询。我正在提取计数数据，需要将其转换为单独的分数。
示例：
5名学生回答“总是”，回答“总是”= 3分;
4名学生回答'通常'并回答'通常'= 2分
我希望有一个名为'Score'的字段，其中包含5行3行和4行，而不是名为'always'且计数为5的字段和名为'always'且字数为4的字段。 2。
我已经使用UNPIVOT启动了我的查询，但是，它没有像所描述的那样拆分数据。我在下面列出了样本数据和我想要的结果。任何帮助，将不胜感激。
Always = 3 points
Usually = 2 points
Sometimes = 1 points
Never = 0 points
示例数据：
CREATE TABLE #TEST(QUESTION VARCHAR(15), STUDENT VARCHAR(15), STARTDATE DATE, ALWAYS INT, USUALLY INT, SOMETIMES INT, NEVER INT)
INSERT #TEST(QUESTION, STUDENT, STARTDATE, ALWAYS, USUALLY, SOMETIMES, NEVER)
VALUES
('A','BOB','01/01/2016',2,1,1,2),
('A','BOB','03/01/2016',3,1,1,0),
('A','JIM','01/01/2016',2,1,2,0),
('A','JIM','03/01/2016',4,1,0,0),
('BB','BOB','03/01/2016',2,1,1,2),
('BB','BOB','07/01/2016',3,1,1,0),
('BB','JIM','03/01/2016',2,1,2,0),
('BB','JIM','07/01/2016',4,1,0,0)
查询：
WITH A AS (
SELECT *
FROM #TEST
--WHERE
-- QUESTION = 'A'
--AND STUDENT IN ('BOB','JIM')
--AND STARTDATE = '2016-01-01'
)
SELECT QUESTION, STUDENT, STARTDATE, SCORE
FROM
( SELECT QUESTION, STUDENT, STARTDATE, ALWAYS, USUALLY, SOMETIMES, NEVER
FROM A
) P
UNPIVOT
( SCORE FOR Z IN (ALWAYS, USUALLY, SOMETIMES, NEVER)
) AS unpvt
预期结果：前2行
QUESTION|STUDENT|STARTDATE|SCORE|
--------+-------+---------+-----+
A |BOB |1/1/2016 |3 |--ALWAYS
A |BOB |1/1/2016 |3 |--ALWAYS
A |BOB |1/1/2016 |2 |--USUALLY
A |BOB |1/1/2016 |1 |--SOMETIMES
A |BOB |1/1/2016 |0 |--NEVER
A |BOB |1/1/2016 |0 |--NEVER
A |BOB |3/1/2016 |3 |--ALWAYS
A |BOB |3/1/2016 |3 |--ALWAYS
A |BOB |3/1/2016 |3 |--ALWAYS
A |BOB |3/1/2016 |2 |--USUALLY
A |BOB |3/1/2016 |1 |--SOMETIMES
答案 0 :(得分：1)
借助CROSS APPLY和ad-hoc计数表
Select A.Question
,A.Student
,A.StartDate
,B.Score
From #Test A
Cross Apply ( values (Always,3)
,(Usually,2)
,(Sometimes,1)
,(Never,0)
) B(Cnt,Score)
Join (Select Top 100 N=Row_Number() Over (Order By Number) From master..spt_values ) C
on (C.N <= B.Cnt)
Where Student='Bob' and question ='A'
返回
Question Student StartDate Score
A BOB 2016-01-01 3
A BOB 2016-01-01 3
A BOB 2016-01-01 2
A BOB 2016-01-01 1
A BOB 2016-01-01 0
A BOB 2016-01-01 0
A BOB 2016-03-01 3
A BOB 2016-03-01 3
A BOB 2016-03-01 3
A BOB 2016-03-01 2
A BOB 2016-03-01 1
答案 1 :(得分：0)
如果您有可管理的列数要进行展开，我通常会为每个列进行单独查询，并与import {TestBed, ComponentFixture} from '@angular/core/testing';
import { NgModel } from '@angular/forms';
import {Component, DebugElement } from '@angular/core';
import {By} from "@angular/platform-browser";
import {MinValueDirective} from './min-value.directive';
@Component({
template: `<input type="number" dleGbMinValue="0">`
})
class TestMinValueDirectiveComponent {
}
describe('Directive: MinValueDirective', () => {
let component : TestMinValueDirectiveComponent;
let fixture: ComponentFixture<TestMinValueDirectiveComponent>;
let inputEl: DebugElement;
beforeEach(() => {
TestBed.configureTestingModule({
declarations: [TestMinValueDirectiveComponent, MinValueDirective]
});
fixture = TestBed.createComponent(TestMinValueDirectiveComponent);
component = fixture.componentInstance;
inputEl = fixture.debugElement.query(By.css('input'));
fixture.detectChanges();
});
it('should stop at min value on change', () => {
expect(inputEl.nativeElement.value).toEqual('');
inputEl.nativeElement.value='-5';
inputEl.triggerEventHandler('change', null);
fixture.detectChanges();
expect(inputEl.nativeElement.value).toEqual(0);
});
});
结合使用。
以下是一般概念：
UNION ALL答案 2 :(得分：0)
使用with a as (
select *
from #test
where question = 'A'
and student = 'bob'
--and student in ('bob','jim')
--and startdate = '20160101'
)
, points as (
select Answer, Points
from (values ('Always',3),('Usually',2),('Sometimes',1),('Never',0)
) p (Answer,Points)
)
, numbers as (
select n
from (values(1),(2),(3),(4),(5),(6),(7),(8),(9)
) t(n)
)
, unp as (
select
a.question
, a.student
, StartDate=convert(varchar(10),a.startdate,120)
, x.AnswerCount
, x.Answer
from a
cross apply (
values ([Always],'Always')
, ([Usually],'Usually')
, ([Sometimes],'Sometimes')
, ([Never],'Never')
) x (AnswerCount,Answer)
)
select
unp.question
, unp.student
, unp.startdate
, score = p.points
, unp.answer
from unp
inner join numbers n on n.n<=unp.AnswerCount
inner join points p on unp.answer=p.answer
取消您的数据，1-9的数字表和积分表，我们可以这样做：
+----------+---------+------------+-------+-----------+
| question | student | startdate | score | answer |
+----------+---------+------------+-------+-----------+
| A | bob | 2016-01-01 | 3 | Always |
| A | bob | 2016-01-01 | 3 | Always |
| A | bob | 2016-01-01 | 2 | Usually |
| A | bob | 2016-01-01 | 1 | Sometimes |
| A | bob | 2016-01-01 | 0 | Never |
| A | bob | 2016-01-01 | 0 | Never |
| A | bob | 2016-01-03 | 3 | Always |
| A | bob | 2016-01-03 | 3 | Always |
| A | bob | 2016-01-03 | 3 | Always |
| A | bob | 2016-01-03 | 2 | Usually |
| A | bob | 2016-01-03 | 1 | Sometimes |
+----------+---------+------------+-------+-----------+
rextester演示：reference
返回：
:app:transformClassesWithDexForDebug FAILED
FAILURE: Build failed with an exception.
*What went wrong:
Execution failed for task ':app:transformClassesWithDexForDebug'.
> com.android.build.api.transform.TransformException: java.lang.RuntimeException:java.lang.RuntimeException:com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: java.lang.UnsupportedOperationException
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Total time: 14.034 secs
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have set up your Android development environment:
https://facebook.github.io/react-native/docs/android-setup.html