SQL Server 根据模式拆分字符串

Question

我正在尝试根据第一个字符和最后一个字符的两种模式拆分特定字符串，第一个字符必须是任何数值，最后一个字符是逗号。

我正在使用 patindex、substring 和 charindex 函数，但它们只提供一行。

这是我正在处理的查询：

DECLARE @x varchar(max) = 'In the vocational certificate category, if served as laundry/dry cleaning specialist, 2 semester hours in treatment of fabrics (stain removing, spotting, solutions), 2 in laundry equipment operation, 2 in dry cleaning, 3 in small business management, 3 in introduction to business, 3 in supply management, and 3 in business report writing.'
   Declare @extract varchar(max) = ''
   set @extract = substring(@x, patindex('%[0-99] [i]%[,] %', @x), (LEN(@x)) -  CHARINDEX('%[0-99] [i]%[,] %', REVERSE(@x))) 
   select @extract 

结果是这样的： 洗衣设备操作2名，干洗2名，小企业管理3名，商业介绍3名，供应管理3名，商业报告撰写3名。

有没有办法在列中获取结果？像这样：

• 2在洗衣设备操作中
• 2中干洗
• 3 小企业管理

...

Answer 1

虽然我同意 sql server 是适合这项工作的错误工具，但它是可行的。您可以使用可在此处找到的 DelimitedSplit8K_LEAD 函数。 https://www.sqlservercentral.com/articles/reaping-the-benefits-of-the-window-functions-in-t-sql-2

那么处理这个就很简单了。请注意，这不会返回“3 in business report writing”，因为这不符合您“最后一个值是逗号”的规则。

DECLARE @x varchar(1000) = 'In the vocational certificate category, if served as laundry/dry cleaning specialist, 2 semester hours in treatment of fabrics (stain removing, spotting, solutions), 2 in laundry equipment operation, 2 in dry cleaning, 3 in small business management, 3 in introduction to business, 3 in supply management, and 3 in business report writing.'

select MyResult = ltrim(s.Item)
from dbo.DelimitedSplit8K_LEAD(@x, ',') s
where left(ltrim(s.Item), 1) like '%[0-9]%'
order by s.ItemNumber

上面的查询将返回。

2 semester hours in treatment of fabrics (stain removing
2 in laundry equipment operation
2 in dry cleaning
3 in small business management
3 in introduction to business
3 in supply management