Query to identify every Wednesday between 2 dates

Hello

I have this code that works well, but I thought it was very ugly.  Optimization or simplifications advice?

select to_date(:startdate, 'YYYY-MM-DD') + rownum -1 as Date_
      from all_objects
     where rownum <=  to_date(:enddate, 'YYYY-MM-DD')-to_date(:startdate, 'YYYY-MM-DD')+1
having to_char(to_date(:startdate, 'YYYY-MM-DD') + rownum -1,'D')='4'   --4 = Wednesday 
group by to_date(:startdate, 'YYYY-MM-DD') + rownum -1
order by to_date(:startdate, 'YYYY-MM-DD') + rownum -1

Thank you

Hugo

Hi, Hugo.

Here's one way:

WITH the settings THAT

(

SELECT TO_DATE (: start_date, "YYYY-MM-DD") AS start_date

, TO_DATE (: end_date, "YYYY-MM-DD") AS end_date

OF the double

)

SELECT the LEVEL - 1 AS dt + start_date

OF parameters

WHERE TO_CHAR (start_date + LEVEL - 1

, "fmDY".

'NLS_DATE_LANGUAGE = ENGLISH'

) = 'SEA '.

CONNECT BY LEVEL<= 1="" +="" end_date="" -="">

;

The key is to lose the GROUP BY.  GROUP BY is to take groups of input lines and the production of 1 line output from them.  You don't do something like that in this problem.

Rather than repeat several times in the same query, a function call (for example, you used

TO_DATE (: startdate, ' YYYY-MM-DD "")

5 times in the query you posted), you can do it once, in a subquery and use the result as many times as you need in a Super application.

CONNECTION BY a 1 row table (or, in this case, the result set) is much more effective than to ROWNUM of object.  In addition, there are a finite number of lines in object.  This number is probably thousands, but there is always a limit.  CONNECT BY works for millions, or more if you need it.

I find TO_CHAR (some_date, 'DY') easier to debug and maintain than TO_CHAR (some_date, 'd').  I can get confused and think "3" means Wednesday, but I am not very inclined to believe that "Mar" means Wednesday, no matter how little coffee I've had.

In addition, it had "format depends on the setting of your NLS_TERRITORY, you can not control within the query. '" " DY"depends on the NLS_LANGUAGE, which you can substitute by passing an argument to TO_CHAR 3rd.  The above query will always look for Wednesday, though they are called Onsdag Mittwoch in your session, and regardless of the question of if she thinks it's the 3rd or the 4th day of the week.

Tags: Database

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select 363500 , 144656 , to_date('26-JUN-12 11.41.50 AM', 'DD-MON-RR HH.MI.SS AM') from dual union all
select 363354 , 144656 , to_date('25-JUN-13 12.41.13 PM', 'DD-MON-RR HH.MI.SS AM') from dual
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A                      B                      DIFF_IN_DAYS
---------------------- ---------------------- ----------------------
319415                 95831                  12
301927                 103509                 1
363810                 144656                 1
363354                 144656                 362

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