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From "Satheesh Bandaram (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-81) Datetime datatypes should allow arithmetic operations on them.
Date Mon, 23 Jan 2006 19:58:13 GMT
     [ http://issues.apache.org/jira/browse/DERBY-81?page=all ]

Satheesh Bandaram updated DERBY-81:
-----------------------------------

    Description: 
Datetime datatypes in Derby are date, time and timestamp. Currently Derby doesn't allow any
arithmetic operations on them, limiting their use. Enable datetime arithmetic in a standard
way.

This feature has already been implemented in 10.1 and is documented in Derby 10.1 manuals.
Refer to functionality there.

  was:
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.


> 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
>      Fix For: 10.1.1.0

>
> Datetime datatypes in Derby are date, time and timestamp. Currently Derby doesn't allow
any arithmetic operations on them, limiting their use. Enable datetime arithmetic in a standard
way.
> This feature has already been implemented in 10.1 and is documented in Derby 10.1 manuals.
Refer to functionality there.

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