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From "Dag H. Wanvik (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-1918) INCREMENT of IDENTITY column described as allowing a value of zero in reference manual
Date Tue, 03 Oct 2006 17:17:19 GMT
INCREMENT of IDENTITY column described as allowing a value of zero in reference manual
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                 Key: DERBY-1918
                 URL: http://issues.apache.org/jira/browse/DERBY-1918
             Project: Derby
          Issue Type: Bug
          Components: Documentation
            Reporter: Dag H. Wanvik
            Priority: Trivial


In the description of how INCREMENT work with IDENTITY columns, th
reference manual is out of step with the implementation in the following respect
(quote from http://db.apache.org/derby/docs/10.2/ref/rrefsqlj37836.html):

> By default, the initial value of an identity column is 1, and the
> amount of the increment is 1. You can specify non-default values for
> both the initial value and the interval amount when you define the
> column with the key words STARTS WITH and INCREMENT BY. And if you
> specify a negative number for the increment value, Derby decrements
> the value with each insert. If this value is 0, or positive, Derby
                                                    ******************
> increments the value with each insert.

In fact, the implementation does not allow a value of zero, but gives
error 42Z21 (LANG_AI_INVALID_INCREMENT):

ij> create table f (i int generated by default as identity (start with 1, increment by
0), j int);

ERROR 42Z21: Invalid increment specified for identity for column 'I'. Increment cannot be
zero.  


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