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Oracle date question

Posted on 2014-02-05
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Last Modified: 2014-02-05
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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Comment
Question by:anumoses
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11 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 39835699
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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LVL 19

Accepted Solution

by:
regmigrant earned 84 total points
ID: 39835702
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...
0
 
LVL 76

Expert Comment

by:slightwv (䄆 Netminder)
ID: 39835705
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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LVL 74

Expert Comment

by:sdstuber
ID: 39835707
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.
0
 
LVL 32

Expert Comment

by:awking00
ID: 39835723
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.
0
 
LVL 13

Expert Comment

by:Alexander Eßer [Alex140181]
ID: 39835753
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!
0
 
LVL 6

Author Comment

by:anumoses
ID: 39835789
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.
0
 
LVL 6

Author Comment

by:anumoses
ID: 39835799
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.
0
 
LVL 76

Assisted Solution

by:slightwv (䄆 Netminder)
slightwv (䄆 Netminder) earned 83 total points
ID: 39835812
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)
0
 
LVL 143

Assisted Solution

by:Guy Hengel [angelIII / a3]
Guy Hengel [angelIII / a3] earned 83 total points
ID: 39835850
and if it's a date:
if to_char(p_start_date, 'YYYY') <> to_char(p_end_date, 'YYYY') then ...
0
 
LVL 6

Author Closing Comment

by:anumoses
ID: 39836038
thanks
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