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Date: Tue, 24 May 2005 04:36:53 +0200 (CEST)
From: "Satheesh Bandaram (JIRA)" <derby-dev@db.apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Assigned: (DERBY-81) Datetime datatypes should allow
 arithmetic operations on them.
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     [ http://issues.apache.org/jira/browse/DERBY-81?page=all ]

Satheesh Bandaram reassigned DERBY-81:
--------------------------------------

    Assign To: Jack Klebanoff  (was: Satheesh Bandaram)

Please update the bug description according to your proposal.

> Datetime datatypes should allow arithmetic operations on them.
> --------------------------------------------------------------
>
>          Key: DERBY-81
>          URL: http://issues.apache.org/jira/browse/DERBY-81
>      Project: Derby
>         Type: New Feature
>   Components: SQL
>     Versions: 10.0.2.0
>  Environment: Generic
>     Reporter: Satheesh Bandaram
>     Assignee: Jack Klebanoff

>
> Datetime datatypes in Derby are date, time and timestamp. Currently Derby doesn't allow any arithmetic operations on them, limiting their use. It would be great to allow statements like:
>    SELECT * FROM log 
>    WHERE modified_time > CURRENT_TIMESTAMP - 1 MONTH
> Commercial databases like Oracle, DB2 and mySQL also have this feature. SQL standard allows these operations along with INTERVAL types. Since Derby doesn't have INTERVAL datatypes, I would like to propose datetime arithmetic to Derby without INTERVALs.
> It should be possible to add, subtract datetime datatypes with a constant like '1 MONTH' (called a duration or INTERVAL in SQL standard). It should also be possible to subtract datetime types where the semantics are allowed according to SQL standard specification.

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