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https://issues.apache.org/jira/browse/DERBY-6340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13789182#comment-13789182
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Dyre Tjeldvoll commented on DERBY-6340:
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Thanks Rick and Knut for helping me understand the details here. 

Wrt. to implementing signature overloading as described in 2-4.28: Looking at 
the rules in 
2-9.6 SR 1)-7) and from there 2-9.7 SR 1)-18); IMHO it would be good to track 
this work in a separate Jira issue.


> Add support for CREATE TYPE AS <existing type> (synonym types)
> --------------------------------------------------------------
>
>                 Key: DERBY-6340
>                 URL: https://issues.apache.org/jira/browse/DERBY-6340
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Dyre Tjeldvoll
>            Assignee: Dyre Tjeldvoll
>         Attachments: CreateTypeAs_fs_draft_2.html, CreateTypeAs_fs_draft.html
>
>
> The SQL standard (2003) chapter 11.41 <user-defined type definition> allows 
> the creation of synonyms or aliases for an existing type: CREATE TYPE AS 
> <predefined type>. By allowing this in Derby we would simplify migration 
> from, and interoperation with, other databases.



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