Обсуждение: merging date and time

Hi,
I'm experiencing some problems to create a view in which I put together a
date and a time in the same field...

I have a table which contain a date field (with a date inside) and a
varchar field with time inside..

This is the content of those two field in one record:

   |22-03-1999|14:45:27

I just wanted to create a view in which those two field are merged in a
datetime filed..

I tried using different approach but I'm always getting an error message orwhile creating the view or when selectin
fromthe created view..
 

examples:

   create view glob_time as select datetime(euigw.day||euigw.time) as tempofrom euigw;

gives me the following error message;

   ERROR:  There is more than one possible operator '||' for types 'date'
and 'varc
   har'
          You will have to retype this query using an explicit cast


create view glob_time as select datetime(text(euigw.day)||euigw.time) as
tempo from euigw;

works file, but then if I do select * from glob_time; I get:

ERROR:  Bad datetime external representation 'Mon 22 Mar 00:00:00 1999
MET14:45:
27'


does anyone have an idea about how to solve this?

thanks,

Marco

miannaco@csc.com wrote:
> 
> Hi,
> I'm experiencing some problems to create a view in which I put together a
> date and a time in the same field...

> 
> ERROR:  Bad datetime external representation 'Mon 22 Mar 00:00:00 1999
> MET14:45:27'
> 
> does anyone have an idea about how to solve this?

Well, the error is exactly what it says - that's not a date time. AS you
can see, the text version of the 'date' type includes a time of
00:00:00. This lead us to a clue - you need to add the time to the date
before the conversion:

test=> create table t1 (d date, t text);
CREATE
test=> insert into t1 values('22-03-1999','14:45:27');
INSERT 101293 1
test=> select datetime(d+timespan(t)) from t1;
datetime                    
----------------------------
Mon Mar 22 14:45:27 1999 CST
(1 row)

test=> drop table t1;
DROP
test=> 


HTH,
Ross

P.S. no need to send your question twice - and it appeared three times!

-- 
Ross J. Reedstrom, Ph.D., <reedstrm@rice.edu> 
NSBRI Research Scientist/Programmer
Computer and Information Technology Institute
Rice University, 6100 S. Main St.,  Houston, TX 77005

On Wed, Mar 31, 1999 at 10:01:20AM -0600, Ross J. Reedstrom wrote:
> test=> create table t1 (d date, t text);
> CREATE
> test=> insert into t1 values('22-03-1999','14:45:27');
> INSERT 101293 1
> test=> select datetime(d+timespan(t)) from t1;
> datetime                    
> ----------------------------
> Mon Mar 22 14:45:27 1999 CST
> (1 row)
> 
> test=> drop table t1;
> DROP
> test=> 

Or more simply...

select ('22-03-1999'::date + '14:45:27'::timespan) as myDateTime;
mydatetime                  
----------------------------
Mon Mar 22 14:45:27 1999 GMT
(1 row)


-- 
If at first you don't succeed, skydiving is not for you...

Hi,

I have two tables, A and B.  A contains records which includes an ID or one
of the records in table B.

A would typically contain the fields:

IDA
IDB
DATA1
DATA2

and B:

IDB
DATA3
DATA4

I have several records in both but a few of the records in A has a IDB field
which does not point to a valid record in B (the record has been deleted).

I know how to get all the records in A that have existing records in B.
SELECT * FROM A, B WHERE A.BID = B.BID.

Now my question ... How do I get the records in A that DO NOT have existing
records in B ???

Perplexed look and deep frown ;-)

Thanks in Advance
Frans