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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3010) WITH DEFAULT value documentation is too liberal
Date Wed, 15 Aug 2007 16:31:30 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12520029
] 

Daniel John Debrunner commented on DERBY-3010:
----------------------------------------------

So according to the above, the current documentation is correct, not "too liberal" right?

So is this really an improvement?

> WITH DEFAULT value documentation is too liberal
> -----------------------------------------------
>
>                 Key: DERBY-3010
>                 URL: https://issues.apache.org/jira/browse/DERBY-3010
>             Project: Derby
>          Issue Type: Bug
>          Components: Documentation
>    Affects Versions: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.1.2.1, 10.1.3.1, 10.2.1.6, 10.2.2.0,
10.3.1.4
>            Reporter: Dag H. Wanvik
>            Priority: Minor
>
> The descrition in the reference manual for DEFAULT value option, leads
> one to assume that the value may be specified as a constant
> expression, e.g.  as (0), whereas Derby (in compliance with the SQL
> standard) is more restrictive.
> In the specifications for CREATE and ALTER TABLE (rrefsqlj81859.dita
> and rrefsqlj30540.dita), "ConstantExpression" is used:
> column-definition: 
> :
> [ [ WITH ] DEFAULT { ConstantExpression | NULL }
>   | generated-column-spec ] 
> :
> This non-terminal symbol is explained in rrefsqlj30540.dita:
> "For the definition of a default value, a ConstantExpression is an
> expression that does not refer to any table. It can include constants,
> date-time special registers, current schemas, users, and null."
> Perhaps one could change the name to ConstantValue and explain it
> as:
> "For the definition of a default value, a ConstantValue means literals,
> date-time special registers, current schemas, users, and null."
> Or better, one could be more explicit and spell out the options in
> more detail..

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