Split data from one field into two fields

I have a field 'called patno_samno' in an SQL 7 table called 'anal_06' which has data in the following format -
218469-001
I want to put the first part (218469) into another field called 'patno1' and the second part (001) into a field called 'samno1'. There are thousands of these entries. The first part (the patno) all have 6 characters and the second (the samno) all have 3 characters and both are seperated by a dash in the 'patno_samno' field.

How do I copy the required data to seperate fields please?
UOCAsked:
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kevin_uCommented:
create the new fields in the database

update anal_06 set patno1 = substr(patno_samno,1,6), samno1 = substr(patno_samno, 8, 3)

you can add a where clause to do it on subsets of data.
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UOCAuthor Commented:
'substr' is not a recognized function name.

I am using SQL7
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Kevin CrossChief Technology OfficerCommented:
Try with substring(str, i, n) where i is starting index and n is count of chars.
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kevin_uCommented:
sorry...  substring.
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Kevin CrossChief Technology OfficerCommented:
If this is variable length and you need to split on hyphen ('-') then just do like this:
update anal_06
set patno1 = left(patno_samno, charindex('-', patno_samno)-1)
, samno1 = right(patno_samno, charindex('-', reverse(patno_samno))-1)
 
-- or with fixed widths, simply
update anal_06
set patno1 = left(patno_samno, 6)
, samno1 = right(patno_samno, 3);

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Kevin CrossChief Technology OfficerCommented:
@kevin_u, welcome to EE!
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UOCAuthor Commented:
Well done. Thanks!
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