Re: [GENERAL] Date & Time

I rechecked the results I sent before, it is not clear, becuase I
run it as a batch. I need a sleep :-) but I do not if there is
a sleep in sql or psql command. so, I use the vaccum! (this is
a development machine!). I re-run it, it looks good now!

anybody know any sleep-like thing for sql ?
##############################################################
test3=> drop table account;

DROP
test3=> CREATE TABLE account (

test3-> act char(1) default 'Y',

test3-> createdfunc DATETIME DEFAULT now(),

test3-> createdcons DATETIME DEFAULT 'now',

test3-> created2cons DATETIME DEFAULT 'current_timestamp',

test3-> createdcurr DATETIME DEFAULT 'current'

test3-> );

CREATE
test3=>

test3=>

test3=> insert into account values('y');

INSERT 283378 1
test3=> vacuum;
VACUUM
test3=> insert into account values('1');

INSERT 283379 1
test3=> vacuum;

VACUUM
test3=> insert into account (createdcons) values(now());

INSERT 283380 1
test3=> vacuum;

VACUUM
test3=> insert into account (createdcons) values(now);

ERROR: Attribute now not found
test3=> vacuum;

VACUUM
test3=> insert into account (createdcons) values('now');

INSERT 283381 1
test3=> vacuum;

VACUUM
test3=> insert into account (createdcons) values(current);
ERROR: Attribute current not found
test3=> vacuum;

VACUUM
test3=> insert into account (createdcons) values('current');

INSERT 283382 1
test3=> vacuum;

VACUUM
test3=> insert into account (createdcons) values(current_timestamp);

INSERT 283383 1
test3=> vacuum;

VACUUM
test3=> insert into account (createdcons) values('current_timestamp');

INSERT 283384 1
test3=> insert into account (createdcons) values(current_timestamp());

ERROR: parser: parse error at or near ")"
test3=> insert into account (createdcons) values(current_timestamp(now));

ERROR: parser: parse error at or near "now"
test3=> insert into account (createdcons) values(current_timestamp('now'));
ERROR: parser: parse error at or near "'"
test3=> insert into account (createdcons) values(now(current_timestamp));

ERROR: No such function 'now' with the specified attributes
test3=> select * from account;

act|createdfunc |createdcons |created2cons|createdcurr
---+----------------------------+----------------------------+------------+-----------
y |Thu Dec 02 12:51:59 1999 CST|Thu Dec 02 12:51:59 1999 CST|current |current
1 |Thu Dec 02 12:52:03 1999 CST|Thu Dec 02 12:51:59 1999 CST|current |current
Y |Thu Dec 02 12:52:06 1999 CST|Thu Dec 02 12:52:06 1999 CST|current |current
Y |Thu Dec 02 12:52:13 1999 CST|Thu Dec 02 12:52:13 1999 CST|current |current
Y |Thu Dec 02 12:52:19 1999 CST|current |current |current
Y |Thu Dec 02 12:52:23 1999 CST|Thu Dec 02 12:52:23 1999 CST|current |current
Y |Thu Dec 02 12:52:26 1999 CST|current |current |current
(7 rows)

test3=> select * from account where createdcons = 'now';

act|createdfunc |createdcons|created2cons|createdcurr
---+----------------------------+-----------+------------+-----------
Y |Thu Dec 02 12:52:19 1999 CST|current |current |current
Y |Thu Dec 02 12:52:26 1999 CST|current |current |current
(2 rows)

test3=> select * from account where createdcons = now();
act|createdfunc |createdcons|created2cons|createdcurr
---+----------------------------+-----------+------------+-----------
Y |Thu Dec 02 12:52:19 1999 CST|current |current |current
Y |Thu Dec 02 12:52:26 1999 CST|current |current |current
(2 rows)

test3=> select * from account where createdcons = 'current';

act|createdfunc |createdcons|created2cons|createdcurr
---+----------------------------+-----------+------------+-----------
Y |Thu Dec 02 12:52:19 1999 CST|current |current |current
Y |Thu Dec 02 12:52:26 1999 CST|current |current |current
(2 rows)

test3=> select * from account where createdcons = 'current_timestamp';

act|createdfunc |createdcons|created2cons|createdcurr
---+----------------------------+-----------+------------+-----------
Y |Thu Dec 02 12:52:19 1999 CST|current |current |current
Y |Thu Dec 02 12:52:26 1999 CST|current |current |current
(2 rows)

test3=> select * from account where createdcons = current_timestamp();

ERROR: parser: parse error at or near ")"
test3=> select * from account where createdcons = current_timestamp('now');
ERROR: parser: parse error at or near "'"
test3=> select * from account where createdcons = 'current_timestamp('now')';

ERROR: parser: parse error at or near "now"
test3=> select * from account where createdcons = 'current_timestamp()';

act|createdfunc |createdcons|created2cons|createdcurr
---+----------------------------+-----------+------------+-----------
Y |Thu Dec 02 12:52:19 1999 CST|current |current |current
Y |Thu Dec 02 12:52:26 1999 CST|current |current |current
(2 rows)

test3=> select * from account where createdcons = 'current_timestamp(now())';

act|createdfunc |createdcons|created2cons|createdcurr
---+----------------------------+-----------+------------+-----------
Y |Thu Dec 02 12:52:19 1999 CST|current |current |current
Y |Thu Dec 02 12:52:26 1999 CST|current |current |current
(2 rows)

test3=>

#############################################################
On Thu, 2 Dec 1999, Bruce Momjian wrote:

> Can you resend the results you had. I can't see the difference.
>
>
> > no. "CURRENT_TIMESTAMP" is the same as "current", which
> > is very very different from "now", which, in turn, also
> > delicately different from "now()" .
> >
> > "current" is not very usefule. If you put "current" in db,
> > it remains there, until when you retrieve the dada, i.e.,
> > it is the "retrieve time". while "now" is our fmailiar
> > "modified time".
> >
> > conclusion: you were right in you book! keep using "now()".
> > (except in where-clause, you should use "now" instead)
> > -- until the now-'feature' is fixed, after that, we can use
> > "now" everywhere).
> >
> > remaining questions: 1) is the behavior of "now" in create
> > table a bug or feature?
> > 2) is "CURRENT_TIMESTAMP" = "current" a bug or not? --
> > need a real sql92 lover here. anybody idea?
> >
> > Kai
> >
> > On Thu, 2 Dec 1999, Bruce Momjian wrote:
> >
> > > > Here is the test. I did not put it in mail because pine did not like
> > > > cut/paste. now I find a way to do it. It looks good!
> > > > the conclusion: current_timestamp is "current" -- it should be,
> > > > the looks closer than now/now() :-)
> > >
> > > So CURRENT_TIMESTAMP is the same as now(), right?
> > >
> > > --
> > > Bruce Momjian | http://www.op.net/~candle
> > > maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
> > > + If your life is a hard drive, | 830 Blythe Avenue
> > > + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
> > >
> >
> >
>
>
> --
> Bruce Momjian | http://www.op.net/~candle
> maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
> + If your life is a hard drive, | 830 Blythe Avenue
> + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
>