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https://issues.apache.org/jira/browse/DERBY-6340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13780412#comment-13780412
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Mamta A. Satoor commented on DERBY-6340:
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For example, if my understanding is clear. one can specify
CREATE TYPE SHOW_SIZE AS INT;
but there is no way to enforce say that the allowed values for SHOE_SIZE is
only 1 through 22.
> 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.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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