How to compare date with char

hi
i am having date from and date to feilds in my overtime element.i want to do the validation on these dates the the dates do not overlap or duplicated.the input value date from and date to are stored in database as varchar2 in the format yyyy/mm/dd 00:00:00. Now if i am trying to compare entered date with these dates i am getting literal does not match format string or date picture ends before....Can any body tell me what to do.
Regards

user10502390 wrote:
hi
i am having date from and date to feilds in my overtime element.i want to do the validation on these dates the the dates do not overlap or duplicated.the input value date from and date to are stored in database as varchar2 in the format yyyy/mm/dd 00:00:00. Now if i am trying to compare entered date with these dates i am getting literal does not match format string or date picture ends before....Can any body tell me what to do.
RegardsPoint a) VERY BAD IDEA storing dates as VARCHAR2 on the database. It will only lead to corrupt data in the future.
Point b) When comparing dates, you should compare them as DATE datatype as the database knows how to do comparisons against DATES. If you try and compare them as VARCHAR2 then you will most likely end up with incorrect comparisons.
If you must have varchar2 storing of your dates/times (there's absolutely no reason to though)... you want...
TO_DATE(:entered_date,'YYYY/MM/DD HH24:MI:SS') BETWEEN TO_DATE(DATEFROM,'YYYY/MM/DD HH24:MI:SS') AND TO_DATE(DATETO,'YYYY/MM/DD HH24:MI:SS')
e.g.
TO_DATE('20080815 13:23:33','YYYY/MM/DD HH24:MI:SS') BETWEEN TO_DATE(DATEFROM,'YYYY/MM/DD HH24:MI:SS') AND TO_DATE(DATETO,'YYYY/MM/DD HH24:MI:SS')

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Message was edited by:
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Excellent suggestions from all of you people!
finally i got the solution
code is:
import java.util.*;
import java.text.*;
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Hello from Germany (Frankfurt) !
I am working on Oracle 9.2.0.8.0
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Elapsed: 00:00:03.02
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Elapsed: 00:00:02.05
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Hi,
there are numerous ways to compare dates, i give you some examples:
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>
can i use to_char to compare date
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SQL> Message was edited by:
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