Oracle SQL對版本號進行排序

Question

在Oracle中，僅使用ORDER BY不會對版本號進行排序。 我的Version_Number字段被聲明為VARCHAR ，我無法更改它。 例如：以下版本：

1.20  
1.9   
1.18  
1.13  
1.5   
1.11  
2.0  
1.8   
1.3   
1.2   
1.1   
1.0   
1.10  

應排序為

2.0   
1.20  
1.18  
1.13 
1.11 
1.10  
1.9   
1.8   
1.5  
1.3   
1.2   
1.1 
1.0   

我已經研究了幾個帖子但是它們似乎都沒有真正服務於我的目的，或者答案是針對SQL Server等而不是Oracle。 我遇到了這個特殊的sql，它似乎看起來很有效。

select version_number from mytable 
order by lpad(version_number, 4) desc;

以這種方式對版本進行排序：

1.20    
1.18   
1.13   
1.11   
1.10   
2.0    
1.9    
1.8   
1.5     
1.3    
1.2    
1.1    
1.0    

我相信這個sql語句適用於SQL Server ：

select version_number from mytable 
order by cast ('/' + replace(version_number , '.', '/') + '/' as hierarchyid) desc;

但是，這不適用於Oracle。 Oracle中是否有hierarchyid的替代方案？


是否有人能夠提出SQL來准確地對這些版本進行排序？

我已經看過下面提到的帖子（鏈接附件）。 所以請不要告訴我這篇文章是重復的。
SQL按版本“number”排序，這是一個長度不一的字符串
如何使用SQL Server查詢對“版本號”列進行排序
Sql Server中的版本號排序
mysql排序版本號
還有很多。

Answer 1

這是一種方法。 先按順序排序. 然后是之后的數字.

select version_number 
from mytable 
order by substr(version_number, 1, instr(version_number,'.')-1) desc
        ,length(substr(version_number, instr(version_number,'.')+1)) desc
        ,substr(version_number, instr(version_number,'.')+1) desc

Answer 2

此SQL支持您的輸入數據以及任何包含的Revision或Build數字。

with 
   inputs as (select '1.20'         as version_number from dual union all  
              select '1.9'          as version_number from dual union all
              select '1.18'         as version_number from dual union all
              select '1.13'         as version_number from dual union all
              select '1.5'          as version_number from dual union all
              select '1.11'         as version_number from dual union all
              select '2.0'          as version_number from dual union all
              select '1.8'          as version_number from dual union all
              select '1.3'          as version_number from dual union all
              select '1.2'          as version_number from dual union all
              select '1.1'          as version_number from dual union all
              select '1.0'          as version_number from dual union all
              select '1.10'         as version_number from dual union all
              select ' 3.1 '        as version_number from dual union all
              select '3.1.1000'     as version_number from dual union all
              select '3.1.1'        as version_number from dual union all
              select '3.1.100'      as version_number from dual union all
              select '3.1.2.1000'   as version_number from dual union all
              select '3.1.2.1'      as version_number from dual union all
              select '3.1.2.100 '   as version_number from dual)
,versions as  (select  trim(version_number) as version_number,
        nvl(LPAD(trim(regexp_substr(version_number, '[^.]+', 1, 1)),5,'0'),'00000') AS Major,
        nvl(LPAD(trim(regexp_substr(version_number, '[^.]+', 1, 2)),5,'0'),'00000') AS Minor, 
        nvl(LPAD(trim(regexp_substr(version_number, '[^.]+', 1, 3)),5,'0'),'00000') AS Revision, 
        nvl(LPAD(trim(regexp_substr(version_number, '[^.]+', 1, 4)),5,'0'),'00000') AS Build 
        from inputs 
        ORDER BY Major desc, Minor desc, Revision desc, Build desc)
--select * from versions; 
select version_number from versions; 

刪除 - 以查看中間結果。

對於OP，將“input as（select ... from dual）”替換為：

   inputs as (select version_number from mytable)

Answer 3

正如Joel Coehoorn 在此提出的建議，“重構版本號存儲使每個部分都有自己的列：MajorVersion，MinorVersion，Revision，Build”。

我正在重新發帖，因為我發現這非常有幫助！

為了擴展，我希望獲得MAX版本號，並最終使用此腳本以及Joel的建議。

    -- GET MAX VERSION NUMBER
    SELECT
        REPLACE(vnum, ' ', '') AS versionum
    FROM
        (SELECT
            MAX(LPAD(major, 4) || '.' || LPAD(minor, 4) || '.' || LPAD(revision, 4)) AS vnum
        FROM
            my_table
        ORDER BY
            major
          , minor
          , revision
        ) tbl1