排序在TSQL

Question

我正在使用SQL Server 2008.

我想通過使用DetailRefNumber排序我的結果。然而，我無法實現像

2.1 
2.2 
2.3 
xxx 
xxx 
2.10 
2.11 
2.12 

請你指導我如何做到這一點？

謝謝。

Answer 1

您可以嘗試PARSENAME

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

Answer 2

我已經 從來沒有 只是試過這個，但你可以嘗試CAST或CONVERT列的順序？

嘗試......

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

這工作：

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 

你的將成爲：

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

編輯

只注意到「版本號排序」。 就拿正是我所做的和改變的最後一部分，愉快使用子/什麼marc_s發佈的作品：

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) 

首先會爲了通過小數點前的數字，然後小數點後的數字，並且2.10大於2.3。

Answer 4

如果DetailRefNumber將總是是一個數字，用點分隔的，你可以添加兩個計算列於表基本上採取列分割成兩個獨立的，數值：

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 

和現在你可以通過這些新的數字列命令：

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)));