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https://issues.apache.org/jira/browse/DERBY-1703?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kim Haase closed DERBY-1703.
----------------------------
Resolution: Fixed
Fix Version/s: 10.2.2.0
Seems to have been fixed as part of DERBY-1839.
> The documentation for (or implementation of) SUBSTR(string,start,length) is
> wrong
> ---------------------------------------------------------------------------------
>
> Key: DERBY-1703
> URL: https://issues.apache.org/jira/browse/DERBY-1703
> Project: Derby
> Issue Type: Bug
> Components: Documentation
> Affects Versions: 10.1.3.1
> Reporter: Dyre Tjeldvoll
> Priority: Minor
> Labels: derby_triage10_5_2
> Fix For: 10.2.2.0
>
>
> The latest alpha manuals say:
> "If startPosition is positive, it refers to position from the start of the
> source expression (counting the first character as 1). If startPosition is
> negative, it is the position from the end of the source."
> But when I try to use substr with a negative starting position, I get:
> $ java org.apache.derby.tools.ij repro.sql
> ij version 10.2
> ij> connect 'jdbc:derby:/home/dt136804/repro;create=true;territory=en_US';
> ij> create table t1(c1 varchar(128));
> 0 rows inserted/updated/deleted
> ij> insert into t1 values ('The dog ate my homework');
> 1 row inserted/updated/deleted
> ij> select substr(c1,-1,8) from t1;
> 1
> --------
> ERROR 22011: The second or third argument of the SUBSTR function is out of
> range.
> and not 'homework' as I would expect.
> The SQL standard (2003) does not seem to say anything about negative starting
> positions...
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