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https://issues.apache.org/jira/browse/DERBY-4842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12920533#action_12920533
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Knut Anders Hatlen commented on DERBY-4842:
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PostgreSQL supports this syntax for DROP TABLE:
http://www.postgresql.org/docs/9.0/static/sql-droptable.html
I couldn't find any mentioning of support for CREATE TABLE [IF NOT EXISTS],
though.
> Support "IF [NOT] EXISTS" in CREATE TABLE and "IF EXISTS" in DROP TABLE
> -------------------------------------------------------------------------
>
> Key: DERBY-4842
> URL: https://issues.apache.org/jira/browse/DERBY-4842
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Reporter: Adrian Tarau
>
> It would be really great if Derby will support these additions similar with
> what MySQL has.
> Also a way to disable constraints when dropping the whole database, so you
> would not be forced to put DROPs in such an order that constraints will not
> fail.
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