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Oracle date question

If
  to_char(:p_start_date, 'MM/DD/YYYY') > to_char(:p_end_date, 'MM/DD/YYYY')  then      

message(........)
( Stops the report)
End if;

I need help when the user runs the report between years like

start date- 01-jan-2013  to
end date- 01-jan-2014

Say the user has to run report always in the year range, ie between jan 2013 and dec 2013. How can I do that.
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anumoses
Asked:
anumoses
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3 Solutions
 
Guy Hengel [angelIII / a3]Billing EngineerCommented:
if p_start_date and p_end_date are already dates, remove the TO_CHAR conversion, as it will "incorrect" results, from "human" point of view.

see this article to explanations:
http://www.experts-exchange.com/Database/Miscellaneous/A_1499-DATE-and-TIME-don%27t-be-scared-and-do-it-right-the-first-time.html

if really you wanted to use TO_CHAR , then with a format like YYYYMMDD , YYYY-MM-DD , YYYY/MM/DD or the like, otherwise the "comparison" will not work according to the "values" of dates.

if you do DD/MM/YYYY or MM/DD/YYYY, it will first compar the months and days values before comparing the year values, as the resulting string is no longer a "date".

hope this clarifies
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regmigrantCommented:
If
  to_char(:p_start_date, 'MM/DD/YYYY') > to_char(:p_end_date, 'MM/DD/YYYY') OR
  to_char(:p_start_date, 'YYYY') <> to_char(:p_end_date, 'YYYY')

Then

etc...
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slightwv (䄆 Netminder) Commented:
First, should you be using to_char?

Assuming to_date is correct, I just make sure I get them in the right order and I don't have to worry about stopping the report:

Use MIN for the left side and MAX for the right side.

min(to_date(:p_start_date, 'MM/DD/YYYY'),to_date(:p_end_date, 'MM/DD/YYYY'))

and

max(to_date(:p_start_date, 'MM/DD/YYYY'),to_date(:p_end_date, 'MM/DD/YYYY'))
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sdstuberCommented:
you mean the user can pick any year they want but they must start on Jan 1 and end on Dec 31?

if so,  then change the prompt to only ask for the year.  Don't make them enter extra values that only serve to add error conditions.
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awking00Commented:
Anumoses, you have got to start treating dates as dates and not characters if you are going to performa any kind of date math. With character data 12/31/2013 is greater than 01/31/2014, which results in inaccurate comparisons.
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Alexander Eßer [Alex140181]Software DeveloperCommented:
If you let the user just pick the year, you could "parse" it like this for your query needed in your report:
select trunc(to_date('2013', 'yyyy'), 'Y') first_day_of_year,
       add_months(trunc(to_date('2013', 'yyyy'), 'Y'), 12) - 1 last_day_of_year
  from dual;

Open in new window

whereas '2013' should be replaced with the appropriate parameter ;-)

Apart from that, I totally agree with awking00: do NOT treat dates as strings in scenarios like yours!
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anumosesAuthor Commented:
you mean the user can pick any year they want but they must start on Jan 1 and end on Dec 31?

if so,  then change the prompt to only ask for the year.  Don't make them enter extra values that only serve to add error conditions.

I cant ask only year. Since the report has to be run on the day and month also. This gives the user a graph for the date range.
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anumosesAuthor Commented:
The message I am trying to give the user is here

The start date and end date has to be within the same year range.
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slightwv (䄆 Netminder) Commented:
assuming p_start_date is a character string:

if to_char(to_date(:p_start_date, 'MM/DD/YYYY'),'YYYY') != to_char(to_date(:p_end_date, 'MM/DD/YYYY'),'YYYY') then
...


You could also do substr:
substr(:p_start_date,7,4) != substr(:p_end_date,7,4)
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
and if it's a date:
if to_char(p_start_date, 'YYYY') <> to_char(p_end_date, 'YYYY') then ...
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anumosesAuthor Commented:
thanks
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