[jira] Issue Comment Edited: (DERBY-3010) WITH DEFAULT value documentation needs improvement

["Kim Haase (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12533509 ] 

chaase3 edited comment on DERBY-3010 at 10/9/07 2:02 PM:
-----------------------------------------------------------

Thank you, Dag! Here is a revised patch. I changed "should" to "must", and I also noticed that in the second bullet item, "SCHEMA or SQLID" actually should have been "CURRENT SCHEMA or CURRENT SQLID" -- at least I think so. Hope this is okay.

The revised patch consists of DERBY-3010-2.diff and DERBY-3010-2.zip.

      was (Author: chaase3):
    Thank you, Dag! Here is a revised patch. I changed "should" to "must", and I also noticed that in the second bullet item, "SCHEMA or SQLID" actually should have been "CURRENT SCHEMA or CURRENT SQLID" -- at least I think so. Hope this is okay.
  
> WITH DEFAULT value documentation needs improvement
> --------------------------------------------------
>
>                 Key: DERBY-3010
>                 URL: https://issues.apache.org/jira/browse/DERBY-3010
>             Project: Derby
>          Issue Type: Improvement
>          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, 10.4.0.0
>            Reporter: Dag H. Wanvik
>            Assignee: Kim Haase
>            Priority: Minor
>         Attachments: defaultConstantExpression.txt, DERBY-3010-2.diff, DERBY-3010-2.zip, DERBY-3010.diff, DERBY-3010.zip
>
>
> 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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