[jira] Updated: (DERBY-81) Datetime datatypes should allow arithmetic operations on them.

     [ http://nagoya.apache.org/jira/browse/DERBY-81?page=history ]

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. 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.

  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://nagoya.apache.org/jira/browse/DERBY-81
>      Project: Derby
>         Type: New Feature
>   Components: SQL
>     Versions: 10.0.2.0
>  Environment: Generic
>     Reporter: Satheesh Bandaram
>     Assignee: Satheesh Bandaram

>
> 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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