SQL根据字符串中的数字排序

2023年2月18日 121次阅读 来源: 曹振华 
USE [Test]
GO

SELECT 
ProcessName
,INDEX1
,INDEX2
,INDEX3
,CAST(SUBSTRING(ProcessName,0,INDEX1) AS INT)*10000
+CAST(SUBSTRING(ProcessName,INDEX1+1,INDEX2-INDEX1-1) AS INT)*100
+CAST(SUBSTRING(ProcessName,INDEX2+1,INDEX3-INDEX2-1) AS INT)
AS Sort
FROM
(
	SELECT ProcessName
	,CHARINDEX('.',ProcessName) AS INDEX1
	,CHARINDEX('.',ProcessName,CHARINDEX('.',ProcessName)+1) AS INDEX2
	,CHARINDEX('.',ProcessName,CHARINDEX('.',ProcessName,CHARINDEX('.',ProcessName)+1)+1) AS INDEX3
	FROM ProcessPublish
) AS table1
ORDER BY Sort ASC

结果如下图：

《SQL根据字符串中的数字排序》

优化代码：字符串中没有三个.，排序序号设置为0

USE [Test]
GO

SELECT 
ProcessName
,INDEX1
,INDEX2
,INDEX3
,CASE WHEN INDEX1>0 AND INDEX2>0 AND INDEX3>0 THEN--判断是否字符中包含3个.
	CAST(SUBSTRING(ProcessName,0,INDEX1) AS INT)*10000
	+CAST(SUBSTRING(ProcessName,INDEX1+1,INDEX2-INDEX1-1) AS INT)*100
	+CAST(SUBSTRING(ProcessName,INDEX2+1,INDEX3-INDEX2-1) AS INT)
ELSE 0 END
AS Sort
FROM
(
	SELECT ProcessName
	,CHARINDEX('.',ProcessName) AS INDEX1
	,CHARINDEX('.',ProcessName,CHARINDEX('.',ProcessName)+1) AS INDEX2
	,CHARINDEX('.',ProcessName,CHARINDEX('.',ProcessName,CHARINDEX('.',ProcessName)+1)+1) AS INDEX3
	FROM ProcessPublish
) AS table1
ORDER BY Sort ASC

    原文作者：曹振华
    原文地址: https://blog.csdn.net/czh4869623/article/details/68062689
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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