从 SQL 服务器中的字符串模式中提取前后字符串

Question

我想从给定文本中提取 AC No、AC Name 和 IFS Code。我可以使用下面的代码提取，但文本位置可能会改变，它对我不起作用。

例如：

UserInfo="AC No: 644640011906AC Name: AkhilAC Type: CurrentIFSC Code: SBIB0003242"

或

UserInfo="IFSC Code: SBIB0003242AC No: 644640011906AC Name: AkhilAC Type: Current"

SQL:

SELECT LTRIM(RTRIM(REPLACE(RIGHT(UserInfo,charindex(':',reverse(UserInfo))-1),'IFSC Code:','')))

请求某人帮助 SQL 查询。

Answer 1

欢迎来到SQL服务器字符串操作的精彩世界！

正如其他评论者所说，像这样导入数据是一个糟糕的想法。如果可以，请集中精力获得更好、更结构化的数据源。

就是说，如果您绝对不能更改数据源并且不想求助于 CLR 代码，那么您将不得不求助于一些非常丑陋的代码SQL 仅当您能够掌握要捕获的键值名称时才有效：

查询

declare @t table(UserID int,UserInfo varchar(200));
insert into @t values
 (1,'IFSC Code: SBIB0003242AC No: 644640011906AC Name: AkhilAC Type: Current')
,(2,'AC No: 644640011906AC Name: AkhilAC Type: CurrentIFSC Code: SBIB0003242')
;

with k as
(
    select *
    from(values('AC No:'),('AC Name:'),('AC Type:'),('IFSC Code:')) as k(k)
)
select UserID
      ,k.k
      ,ltrim(replace(substring(v.v,c.s,c.e-c.s),k.k,'')) as v
from @t as t
    cross join k
    cross apply(values(replace(
                         replace(
                           replace(
                             replace(
                               t.UserInfo
                               ,'AC No:'
                               ,case when k.k = 'AC No:' then 'AC No:' else '|' end
                               )
                             ,'AC Name:'
                             ,case when k.k = 'AC Name:' then 'AC Name:' else '|' end
                             )
                           ,'AC Type:'
                           ,case when k.k = 'AC Type:' then 'AC Type:' else '|' end
                           )
                         ,'IFSC Code:'
                         ,case when k.k = 'IFSC Code:' then 'IFSC Code:' else '|' end
                         ) + '|'
                      )
               ) as v(v)
    cross apply(values(patindex('%' + k.k + '%',v.v)
                      ,charindex('|',v.v,patindex('%' + k.k + '%',v.v))
                      )
               ) as c(s,e);

输出

+--------+------------+--------------+
| UserID |     k      |      v       |
+--------+------------+--------------+
|      1 | AC No:     | 644640011906 |
|      1 | AC Name:   | Akhil        |
|      1 | AC Type:   | Current      |
|      1 | IFSC Code: | SBIB0003242  |
|      2 | AC No:     | 644640011906 |
|      2 | AC Name:   | Akhil        |
|      2 | AC Type:   | Current      |
|      2 | IFSC Code: | SBIB0003242  |
+--------+------------+--------------+

Answer 2

select  
SUBSTRING(UserInfo, CHARINDEX('AC No: ',UserInfo)+7, 
 ( select min(x*(case x when 0 then null else 1 end)) 
       from 
       ( 
         VALUES 
         (CHARINDEX('AC Name: ',UserInfo,CHARINDEX('AC No: ',UserInfo)+7)),
         (CHARINDEX('AC Type: ',UserInfo,CHARINDEX('AC No: ',UserInfo)+7)),
         (CHARINDEX('IFSC Code: ',UserInfo,CHARINDEX('AC No: ',UserInfo)+7)),
         (LEN(UserInfo)+1)
       )
       AS value(x)
       
 ) - (CHARINDEX('AC No: ',UserInfo)+7)

)
as AC_No,

SUBSTRING(UserInfo, CHARINDEX('AC Name: ',UserInfo)+9, 
 ( select min(x*(case x when 0 then null else 1 end)) 
       from 
       ( 
         VALUES 
         (CHARINDEX('AC No: ',UserInfo,CHARINDEX('AC Name: ',UserInfo)+9)),
         (CHARINDEX('AC Type: ',UserInfo,CHARINDEX('AC Name: ',UserInfo)+9)),
         (CHARINDEX('IFSC Code: ',UserInfo,CHARINDEX('AC Name: ',UserInfo)+9)),
         (LEN(UserInfo)+1)
       )
       AS value(x)
       
 ) - (CHARINDEX('AC Name: ',UserInfo)+9)
)
as AC_Name,
SUBSTRING(UserInfo, CHARINDEX('IFSC Code: ',UserInfo)+11, 

 ( select min(x*(case x when 0 then null else 1 end)) 
       from 
       ( 
         VALUES 
         (CHARINDEX('AC No: ',UserInfo,CHARINDEX('IFSC Code: ',UserInfo)+11)),
         (CHARINDEX('AC Type: ',UserInfo,CHARINDEX('IFSC Code: ',UserInfo)+11)),
         (CHARINDEX('AC Name: ',UserInfo,CHARINDEX('IFSC Code: ',UserInfo)+11)),
         (LEN(UserInfo)+1)
       )
       AS value(x)
       
 ) - (CHARINDEX('IFSC Code: ',UserInfo)+11)

)
as IFSC_Code

from test

那么最好只执行一次，同时将数据加载到分段 table 等中，然后将这些值存储在生产中的适当字段中 table.

Fiddle 示例： https://dbfiddle.uk/?rdbms=sqlserver_2014&fiddle=a5fdfbbd6a0b4657602af39744993a91

从 SQL 服务器中的字符串模式中提取前后字符串

Extract string before and after from string pattern in SQL Sever

sql

sql-server

sql-server-2012

查询

输出