From: | "Thomas G(dot) Lockhart" <lockhart(at)alumni(dot)caltech(dot)edu> |
---|---|
To: | Jose Soares Da Silva <sferac(at)bo(dot)nettuno(dot)it> |
Cc: | pgsql-hackers(at)postgresql(dot)org, pgsql-docs(at)postgresql(dot)org |
Subject: | Re: [HACKERS] Re: [DOCS] Reference Manual |
Date: | 1998-04-01 14:33:42 |
Message-ID: | 35225046.78645566@alumni.caltech.edu |
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Thread: | |
Lists: | pgsql-hackers |
> The point is: why EXTRACT accepts only date types ?
> SQL92 specifies date, time, timestamp and interval.
tgl=> select extract (year from date 'now');
date_part
---------
1998
(1 row)
tgl=> select extract (year from datetime 'now');
date_part
---------
1998
(1 row)
tgl=> select extract (year from abstime 'now');
date_part
---------
1998
(1 row)
tgl=> select extract(year from timestamp 'now');
date_part
---------
1998
(1 row)
tgl=> select extract (hour from timespan '5 hours');
date_part
---------
5
(1 row)
tgl=> select extract (hour from reltime '5 hours');
date_part
---------
5
(1 row)
tgl=> select extract (hour from interval '5 hours');
date_part
---------
5
(1 row)
And,
tgl=> select extract (hour from time '03:04:05');
ERROR: function 'time_timespan(time)' does not exist
This is a known problem; will fix for v6.4.
- Tom
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Previous Message | Maurice Gittens | 1998-04-01 13:48:16 | patch for some more overruns; two to go |