排序在TSQL

Question

我正在使用SQL Server 2008.

我想通过使用DetailRefNumber排序我的结果。然而，我无法实现像

2.1 
2.2 
2.3 
xxx 
xxx 
2.10 
2.11 
2.12 

请你指导我如何做到这一点？

谢谢。

Answer 1

您可以尝试PARSENAME

ORDER BY CAST(PARSENAME(DetailRefNumber,2) AS INT),CAST(PARSENAME(DetailRefNumber,1) AS INT) 

Answer 2

我已经 从来没有 只是试过这个，但你可以尝试CAST或CONVERT列的顺序？

尝试......

SELECT 
... 
FROM 
... 
ORDER BY 
CAST(MyColumn AS Decimal(18,2)) 

这工作：

CREATE TABLE #t 
(
    mycol varchar(20) 
) 

INSERT INTO #t(mycol) VALUES('1.0') 
INSERT INTO #t(mycol) VALUES('1.10') 
INSERT INTO #t(mycol) VALUES('2.10') 
INSERT INTO #t(mycol) VALUES('21.20') 
INSERT INTO #t(mycol) VALUES('2.00') 

SELECT * FROM #t ORDER BY CAST(mycol as Decimal(18,2)) 

DROP TABLE #t 

你的将成为：

SELECT 
    AssessmentID, 
    AssessmentRefNumber, 
    DetailRefNumber 
FROM 
    Assessments 
ORDER BY 
    CAST(DetailRefNumber As Decimal(18,2)) 

编辑

只注意到“版本号排序”。 就拿正是我所做的和改变的最后一部分，愉快使用子/什么marc_s发布的作品：

CREATE TABLE #t 
(
    mycol varchar(20) 
) 

INSERT INTO #t(mycol) VALUES('1.0') 
INSERT INTO #t(mycol) VALUES('1.2') 
INSERT INTO #t(mycol) VALUES('1.11') 
INSERT INTO #t(mycol) VALUES('2.10') 
INSERT INTO #t(mycol) VALUES('21.20') 
INSERT INTO #t(mycol) VALUES('2.20') 
INSERT INTO #t(mycol) VALUES('2.00') 
INSERT INTO #t(mycol) VALUES('2.11') 
INSERT INTO #t(mycol) VALUES('2.2') 

SELECT 
    * 
FROM #t 
ORDER BY 
    CAST(LEFT(mycol, CHARINDEX('.', myCol)-1) AS int), 
    CAST(SUBSTRING(myCol, CharINDEX('.', mycol)+1, 999) AS int) 

Answer 3

您需要使用SUBSTRING和CAST ...

order by 
    CAST(SUBSTRING(DetailRefNumber, 0, 1) as int), 
    CAST(SUBSTRING(DetailRefNumber, 2, LEN(DetailRefNumber) - 2) as int) 

首先会为了通过小数点前的数字，然后小数点后的数字，并且2.10大于2.3。

Answer 4

如果DetailRefNumber将总是是一个数字，用点分隔的，你可以添加两个计算列于表基本上采取列分割成两个独立的，数值：

alter table dbo.YourTable 
    add RefNrMajor AS CAST(LEFT(DetailRefNumber, CHARINDEX('.', DetailRefNumber) - 1) AS INT) PERSISTED 

alter table dbo.YourTable 
    add RefNrMinor AS CAST(SUBSTRING(DetailRefNumber, CHARINDEX('.', DetailRefNumber) + 1, 999) AS INT) PERSISTED 

和现在你可以通过这些新的数字列命令：

SELECT (columns) 
FROM dbo.YourTable 
ORDER BY RefNrMajor, RefNrMinor 

Answer 5

select * 
from yourTable 
order by 
assessmentRefNum, 
convert(int,right(detailRefNum,len(detailRefNum)-charindex('.',detailRefNum,1)));