Question

date comparsion problem

Asked by: rutledgj

I have the following partial sql statement that I'm trying to execute from vb.net code:

Dim currdate as string = date.now.tostring('MM/dd/yyyy")

select prm.datefrom
from prmmain prm
where to_char(prm.datefrom,'MM/DD/YYYY')  >= '" + currDate + "' "

prm.datefrom is a datetime column.
This doesn't work because now I'm comparing strings instead of dates. Is there a way for me to convert these back to dates or somehow keep them as dates to begin with?

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Asked On
2007-02-16 at 06:29:29ID22394050
Tags

date

,

sql

,

comparsion

Topics

PL / SQL

,

Microsoft Visual Basic.Net

Participating Experts
3
Points
250
Comments
7

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Answers

 

by: razoPosted on 2007-02-16 at 06:47:18ID: 18548726

select prm.datefrom
from prmmain prm
where prm.datefrom  >=to_date('" + currDate + "',mm/dd/yyyy)"

 

by: rutledgjPosted on 2007-02-16 at 06:53:24ID: 18548778

Will this work if the prm.datefrom table format is not just a date? It is a date and time value in the table.

 

by: razoPosted on 2007-02-16 at 07:00:05ID: 18548853

if u want u can use trunc(prm.datefrom ) to get the date at 12:00 AM

 

by: ZeonFlashPosted on 2007-02-16 at 07:10:46ID: 18548946

You can also try using the DATEDIFF SQL function.

select prm.datefrom
from prmmain prm
where DATEDIFF(DAY, prm.datefrom, '" & currDate & "') < 0

 

by: rutledgjPosted on 2007-02-16 at 07:25:36ID: 18549082

Well, this doesn't seem to work. I get a oracle error (not a valid month) when I use this query:

Select prm.pkey as prmpkey, prm.TacticParentPKey, jb.PKey as jbpkey, jb.tacticpkey, prm.phase, prm.datefrom, jbmeta.standardjobs From PRMMAIN prm LEFT JOIN JOBDEFINITIONLIST jb on jb.TacticPkey = prm.PKey Left JOIN jobdefinitionlistmeta jbmeta on jbmeta.pkey = jb.jobdeflistmetapkey WHERE ((prm.tacticparentpkey is not null) and (prm.tacticparentpkey <> ' ')) AND jb.tacticpkey is not null AND prm.datefrom >= to_date('02/16/2007')

 

by: hans_vdPosted on 2007-02-16 at 07:37:05ID: 18549189

You forgot the format string (see Razo's solution).  The query should look like this:

Select prm.pkey as prmpkey, prm.TacticParentPKey, jb.PKey as jbpkey, jb.tacticpkey, prm.phase, prm.datefrom, jbmeta.standardjobs From PRMMAIN prm LEFT JOIN JOBDEFINITIONLIST jb on jb.TacticPkey = prm.PKey Left JOIN jobdefinitionlistmeta jbmeta on jbmeta.pkey = jb.jobdeflistmetapkey WHERE ((prm.tacticparentpkey is not null) and (prm.tacticparentpkey <> ' ')) AND jb.tacticpkey is not null AND prm.datefrom >= to_date('02/16/2007', 'mm/dd/yyyy')

 

by: razoPosted on 2007-02-16 at 07:39:52ID: 18549218

to_date('02/16/2007','mm/dd/yyyy')

20120131-EE-VQP-002

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