SQL Server-基于字符串和数字的排序列

Question

我有一个包含一列的表，其中包含字符串和数字的组合，如下所示。 我需要按降序或升序对名称列进行排序，但是问题是，当我使用ORDER BY时，它没有按预期排序

我的查询如下所示

SELECT * FROM test ORDER BY `name` ASC

我的预期结果如图所示

employee1
employee2
employee3
employee6
employee6
employee10
employee11
employee12
employee17
employee82
employee100
employee111
employee129
employee299

任何人都可以帮我这个

Answer 1

您可以通过仅从字段中提取数字部分来尝试以下操作

SELECT * FROM test 
ORDER BY cast(replace(`name`,'employee','') as int) ASC

Answer 2

由于数字总是在最后，你可以做到

WITH CTE AS
(
SELECT 'employee1' Name
union all select 'employee2'
union all select 'employee3'
union all select 'employee6'
union all select 'employee6'
union all select 'employee10'
union all select 'employee11'
union all select 'employee12'
union all select 'employee17'
union all select 'employee82'
union all select 'employee100'
union all select 'employee111'
union all select 'employee129'
union all select 'employee299'
)
SELECT Name
FROM CTE
ORDER BY CAST(SUBSTRING(Name, PATINDEX('%[^a-z, '' '']%', Name), LEN(Name)) AS INT)
--OR PATINDEX('%[0-9]%', Name)

要么

WITH CTE AS
(
SELECT 'The First Employee 1' Name
union all select 'The Second One 2'
union all select 'Employee Number 4'
union all select 'Employee Number 3'
)
SELECT Name
FROM CTE
ORDER BY CAST(SUBSTRING(Name, PATINDEX('%[0-9]%', Name), LEN(Name)) AS INT)

这是一个现场演示 ，您可以在其中更改字符串并查看结果。

好的，我要指出一个真正的问题，那就是一个只有一列却没有PK的表 。

Answer 3

请尝试以下代码：

-- ASSUMES NUMBERS ARE IN THE LAST CHARACTER
-- WONT WORK IF NUMBER IS THERE IN THE MIDDLE

DROP TABLE IF EXISTS #data

select 
 Name        = REPLACE(name,' ','') 
,NameWithNum = REPLACE(name,' ','') + cast(object_id as varchar(100))
INTO #data
from sys.tables

SELECT 
 NameWithNum
,NameRemovedNumbers= SUBSTRING(NameWithNum, PATINDEX('%[0-9]%', NameWithNum), LEN(NameWithNum))
from #data
ORDER BY Name,SUBSTRING(NameWithNum, PATINDEX('%[0-9]%', NameWithNum), LEN(NameWithNum))

Answer 4

名称的“基本”部分相同。 所以，您可以按长度订购，然后按名称订购：

SELECT t.*
FROM test t
ORDER BY LEN(name), name;