How can i use substring in SQL? [duplicate]

问题

Possible Duplicate:
How can I rearrange string with SQL?



Declare @CustTotalCount as int
Declare @CustMatchCount as int 
 select @CustTotalCount = count(*)  from ENG_CUSTOMERTALLY

 select @CustMatchCount = count(*)  from Task  where MPDReference in(
 select ENG_CUSTOMERTALLY_CUSTOMERTASKNUMBER from dbo.ENG_CUSTOMERTALLY)

if(@CustTotalCount>@CustMatchCount)
select distinct
 substring(ENG_CUSTOMERMYCROSS_MYTECHNIC_TASK_NO, charindex('-', ENG_CUSTOMERMYCROSS_MYTECHNIC_TASK_NO)
 + 1, 1000)
  from dbo.ENG_CUSTOMERMYCROSS where
 ENG_CUSTOMERMYCROSS_CUSTOMER_NUMBER in(
select ENG_CUSTOMERTALLY_CUSTOMERTASKNUMBER from ENG_CUSTOMERTALLY1
except
select MPDReference from Task )

i can convert below string data

A320-200001-01-1(1)
A320-200001-01-1(2)
A320-200001-01-1(1)

200001-01-1(1)
200001-01-1(2)
200001-01-1(1)

But i need

200001-01-1
200001-01-1
200001-01-1

distict ---> 200001-01-1 How can i do that SQL and C# ?

回答1:

I gave this answer in the duplicate question too.

Here's a technique that uses PATINDEX, which can use wild cards.

SUBSTRING(ENG_CUSTOMERMYCROSS_MYTECHNIC_TASK_NO,
        PATINDEX('%[0-9]%', ENG_CUSTOMERMYCROSS_MYTECHNIC_TASK_NO),
        PATINDEX('%(%', ENG_CUSTOMERMYCROSS_MYTECHNIC_TASK_NO)
                 - PATINDEX('%[0-9]%', ENG_CUSTOMERMYCROSS_MYTECHNIC_TASK_NO)
                )

The start for your substring is the position of the first numeric value (%[0-9]%). The length value is the position of the first parenthesis ('%(%') less the starting position.

回答2:

You could

SELECT DISTINCT SUBSTRING(....) FROM ...

来源：https://stackoverflow.com/questions/3634274/how-can-i-use-substring-in-sql

标签

sql

sql-server-2005