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Re: index over timestamp not being used

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: arnaulist(at)andromeiberica(dot)com
Cc: PostgreSQL Performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: index over timestamp not being used
Date: 2007-07-24 19:43:15
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Arnau <arnaulist(at)andromeiberica(dot)com> writes:
>> Alternatively, do you really need to_timestamp at all?  The standard
>> timestamp input routine won't have any problem with that format:
>> t.timestamp_in >= '20070101'

> This is always I think I'm worried, what happens if one day the internal 
> format in which the DB stores the date/timestamps changes. I mean, if 
> instead of being stored as YYYYMMDD is stored as DDMMYYYY, should we 
> have to change all the queries?

You are confusing internal storage format with the external

> I thought the 
> to_char/to_date/to_timestamp functions were intented for this purposes

No, they're intended for dealing with wacky formats that the regular
input/output routines can't understand or produce.

			regards, tom lane

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