How to Create a View with all days in year. view should fill with dates from JAN-01 to Dec-31. How can I do this in Oracle ?
If current year have 365 days,view should have 365 rows with dates. if current year have 366 days,view should have 366 rows with dates. I want the view to have a single column of type DATE.
This simple view will do it:
create or replace view year_days as
select trunc(sysdate, 'YYYY') + (level-1) as the_day
from dual
connect by level <= to_number(to_char(last_day(add_months(trunc(sysdate, 'YYYY'),11)), 'DDD'))
/
Like this:
SQL> select * from year_days;
THE_DAY
---------
01-JAN-11
02-JAN-11
03-JAN-11
04-JAN-11
05-JAN-11
06-JAN-11
07-JAN-11
08-JAN-11
09-JAN-11
10-JAN-11
11-JAN-11
...
20-DEC-11
21-DEC-11
22-DEC-11
23-DEC-11
24-DEC-11
25-DEC-11
26-DEC-11
27-DEC-11
28-DEC-11
29-DEC-11
30-DEC-11
31-DEC-11
365 rows selected.
SQL>
The date is generated by applying several Oracle date functions:
trunc(sysdate, 'yyyy') gives us the first of January for the current yearadd_months(x, 11) gives us the first of Decemberlast_day(x) gives us the thirty-first of Decemberto_char(x, 'DDD') gives us the number of the thirty-first of December, 365 this year and 366 next. CONNECT BY LEVEL <= X