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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