From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
---|---|
To: | Sachin Srivastava <sachin(dot)srivastava(at)enterprisedb(dot)com> |
Cc: | pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: timestamp issue |
Date: | 2011-02-17 07:42:31 |
Message-ID: | 4D5CD167.10908@enterprisedb.com |
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Thread: | |
Lists: | pgsql-bugs |
On 17.02.2011 08:06, Sachin Srivastava wrote:
> postgres=# SELECT now() + '7 days' AS week_ahead;
> week_ahead
> ----------------------------------
> 2011-02-24 10:39:29.951931+05:30
> (1 row)
>
> postgres=# SELECT now() - '7 days' AS week_behind;
> ERROR: invalid input syntax for type timestamp with time zone: "7 days"
> LINE 1: SELECT now() - '7 days' AS week_behind;
> ^
>
> Now, if '+' operator works with '7 days', why dint the '-' operator? Is this intentional or a bug?
Intentional, or at least coincidental.
postgres=# SELECT oprname, oprleft::regtype, oprright::regtype FROM
pg_operator WHERE oprleft ='timestamptz'::regtype AND oprname IN('+', '-');
oprname | oprleft | oprright
---------+--------------------------+--------------------------
+ | timestamp with time zone | interval
- | timestamp with time zone | timestamp with time zone
- | timestamp with time zone | interval
(3 rows)
With '-', it's getting interpreted as timestamptz-timestamptz.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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