Re: [GENERAL] Date & Time

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() :-)

###############################################################
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 283346 1
test3=> insert into account values('1');
INSERT 283347 1
test3=> insert into account (createdcons) values(now());

INSERT 283348 1
test3=> insert into account (createdcons) values(now);

ERROR: Attribute now not found
test3=> insert into account (createdcons) values('now');

INSERT 283349 1
test3=> insert into account (createdcons) values(current);

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

INSERT 283350 1
test3=> insert into account (createdcons) values(current_timestamp);

INSERT 283351 1
test3=> insert into account (createdcons) values('current_timestamp');

INSERT 283352 1
test3=>
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=>

test3=> select * from account;

act|createdfunc |createdcons |created2cons|createdcurr
---+----------------------------+----------------------------+------------+-----------
y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:33 1999 CST|current |current
1 |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:33 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:34 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:34 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|current |current |current
Y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:34 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|current |current |current
(7 rows)

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

act|createdfunc |createdcons |created2cons|createdcurr
---+----------------------------+----------------------------+------------+-----------
Y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:34 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:34 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|current |current |current
Y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:34 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|current |current |current
(5 rows)

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

act|createdfunc |createdcons |created2cons|createdcurr
---+----------------------------+----------------------------+------------+-----------
Y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:34 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:34 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|current |current |current
Y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:34 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|current |current |current
(5 rows)

test3=> select * from account where createdcons = 'current';
act|createdfunc |createdcons |created2cons|createdcurr
---+----------------------------+----------------------------+------------+-----------
Y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:34 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:34 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|current |current |current
Y |Thu Dec 02 08:41:34 1999 CST|Thu Dec 02 08:41:34 1999 CST|current |current
Y |Thu Dec 02 08:41:34 1999 CST|current |current |current
(5 rows)

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

act|createdfunc |createdcons|created2cons|createdcurr
---+----------------------------+-----------+------------+-----------
Y |Thu Dec 02 08:41:34 1999 CST|current |current |current
Y |Thu Dec 02 08:41:34 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"

##############################################################
On Wed, 1 Dec 1999, Bruce Momjian wrote:

> > Ed Loehr ha scritto:
> >
> > > Just curious: anyone have any comment on any practical differences between now() and CURRENT_TIMESTAMP, which seems to work
> > > the same?
> > >
> >
> > I think it is the same function, both of them return the current date and time.
> >
> > now() should be the internal postgreSQL function.
> > and CURRENT_TIMESTAMP is the exact SQL-92 syntax
>
> I am changing my book to use CURRENT_TIMESTAMP rather than now().
>
> --
> 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
>
> ************
>