SQL视图SUBSTRING和CHARINDEX

Question

I have a query in SQL 2008

SELECT [orde_reference],
       SUBSTRING([orde_reference], 
                  CHARINDEX('/', [orde_reference]) + 1, 
                  LEN([orde_reference])) AS batch
FROM   Orders 

That returns the following

orde_reference:        27777/2012/1          
batch:                 2012/1

However I need the batch to just be the characters after the last / (there are always 2 x '/' in the varchar

orde_reference:        27777/2012/1          
batch:                 1

Any help would be appreciated.

Cheers Mim

Answer 1

Try

SELECT orde_reference,
       RIGHT(orde_reference, CHARINDEX('/', REVERSE(orde_reference)) - 1) batch
  FROM orders

Sample output:

| ORDE_REFERENCE | BATCH |
--------------------------
|   27777/2012/1 |     1 |
|  27734/2013/11 |    11 |

Here is SQLFiddle demo

Answer 2

Use REVERSE twice ;)

SELECT [orde_reference]
  ,REVERSE(SUBSTRING(reverse([orde_reference]), 0, CHARINDEX('/', reverse([orde_reference])))) AS batch
  from (values(
  ' 27777/2012/123'
  )) as O([orde_reference])

Answer 3

As there are always 2 / you can pass the optional third argument to CHARINDEX ( start_location ) to tell it to start looking after the first one.

SELECT [orde_reference],
       SUBSTRING([orde_reference], 
                  CHARINDEX('/', [orde_reference],1 + CHARINDEX('/', [orde_reference])) + 1, 
                  LEN([orde_reference])) AS batch
FROM   Orders 

You would be better off storing these components individually however in separate columns.