Pull 3 digits from middle of id and sort by even odd - sql

Question

I have file ids in my database that start with:
a single character prefix
a period
a three digit client id
a hyphen
a three digit file number.
Example F.129-123
We have several ids for each client.
I need to be able to strip out the three digit file number and then pull them based on even or odd so that I can assign specific data to each result population.
One added issue. Some of the ids have characters added at the end.
Example: F.129-123A or F.129-123.NF
So I need to be able to just use the three digit file number without any other characters, because the added characters create errors while conversion.

Answer 1

If you are using SQL SERVER,
you can use CHARINDEX() to find the index of - and then
get 3 digits after - using SUBSTRING()
SELECT substring('F.123-234',charindex('-','F.123-234')+1, 3)
If you are using MySQL,
you can use POSITION() to find the index of - and then get 3 digits after - using SUBSTRING()
SELECT SUBSTRING('F.123-234',POSITION( '-' IN 'F.123-234' )+1,3);
If you are using Oracle,
you can use INSTR() to find the index of - and then get 3 digits after - using SUBSTR()
UPDATES:
Based on the requirements in comments, you can use a query like below achieve what you need.
SELECT
SUBSTRING(MatterID,CHARINDEX('-',MatterID)+1, 3) as FileNo
FROM
Matters
WHERE
MatterID LIKE'f.129%'
AND MatterID NOT LIKE '%col%'
AND substring( MatterID, CHARINDEX('-',MatterID)+1, 3) % 2 = 0

Answer 2

If you are working with Microsoft SQL Server, then you could use of patindex() function with substring() function to get the only 3 digits file number
select left(substring(string, PATINDEX('%[0-9][-]%', string)+2, LEN(string)), 3)
Note that if you have other period (i.e. -, /) then you will need to modify chars like PATINDEX('%[0-9][/]%')

Answer 3

In Postgres you can use split_part() to get the part after the hyphen, then cast it to an integer:
select *
from the_table
order by split_part(file_id, '-', 2)::int;
This assumes that there is always exactly one - in the string. I understand your question that this is the case as the format is fixed.

Answer 4

Is this helpful
Create table #tmpFileNames(id int, FileName VARCHAR(50))
insert into #tmpFileNames values(1,'F.129-123')
insert into #tmpFileNames values(2,'F.129-125')
insert into #tmpFileNames values(3,'F.129-124')
insert into #tmpFileNames values(4,'F.129-123A')
insert into #tmpFileNames values(5,'F.129-124B')
insert into #tmpFileNames values(6,'F.129-125.PQ')
insert into #tmpFileNames values(7,'F.129-123.NF')
select SUBSTRING(STUFF(FileName, 1, CHARINDEX('-',FileName), ''),0,4), * from #tmpFileNames
Order by SUBSTRING(STUFF(FileName, 1, CHARINDEX('-',FileName), ''),0,4),id
Drop table #tmpFileNames