[jira] Commented: (DERBY-4399) Syntax description for TableViewOrFunctionExpression lack subquery option

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

    [ https://issues.apache.org/jira/browse/DERBY-4399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780134#action_12780134 ] 

Kim Haase commented on DERBY-4399:
----------------------------------

I've been meaning to pick this up for weeks, so I thought I'd better start on it. 

I'm wondering if I should retitle the correlation-Name topic Correlation and rewrite it, or whether we need a new Correlation topic in between the TableViewOrFunctionExpression topic and the correlation-Name topic. Rewriting the correlation-Name topic might be simpler.

TableViewOrFunctionExpression: http://db.apache.org/derby/docs/dev/ref/rrefsqlj33215.html
correlation-Name: http://db.apache.org/derby/docs/dev/ref/rrefcorrelationname.html

In either case I need a definition of the term "Correlation" -- can you help me out, Dag or Knut? Thanks!

> Syntax description for TableViewOrFunctionExpression lack subquery option
> -------------------------------------------------------------------------
>
>                 Key: DERBY-4399
>                 URL: https://issues.apache.org/jira/browse/DERBY-4399
>             Project: Derby
>          Issue Type: Bug
>          Components: Documentation
>            Reporter: Dag H. Wanvik
>
> In the reference manual, we find these syntax descriptions (start with http://db.apache.org/derby/docs/dev/ref/rrefsqlj21583.html):
> TableExpression:
> {
>   TableViewOrFunctionExpression | JOIN operation 
> }
> TableViewOrFunctionExpression:
> { table-Name | view-Name | TableFunctionInvocation}
>     [ [ AS ] correlation-Name
>         [ (Simple-column-Name [ , Simple-column-Name]* ) ] ] ]
> I cannot find a way from the "FROM clause" to the TableSubquery production, so I think the latter should read:
> { table-Name | TableSubquery | view-Name | TableFunctionInvocation }
>     [ [ AS ] correlation-Name
>         [ (Simple-column-Name [ , Simple-column-Name]* ) ] ] ]
> Also, the "JOIN operation" is not clickable.

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