Reputation: 35
I am relatively new to Oracle so i'd really appreciate some help.
I have a query like:
SELECT * FROM reservations WHERE date between (date1) and (date2).
What I need is to get all the reservations within the interval : today's date and today's date -1 year, so basically 1 year of history.
I want to run the above query with interval of 1 months, and export the query set to excel. I need some help in the logic of the loop (create a stored procedure or function), as i will think later for the export to excel.
Upvotes: 1
Views: 193
Reputation: 442
Here is the procedure to create the queries month-wise starting from sysdate .
create or replace procedure monthwise_query
as
t_date DATE := TRUNC(SYSDATE) ;
c_date DATE ;
BEGIN
FOR i in 1..12
LOOP
c_date := t_date;
dbms_output.put_line('select * from reservations where rev_date between to_date('''||c_date||''',''DD-MON-YY'') and (select add_months(to_date('''||c_date||''',''DD-MON-YY''),-1) from dual);');
select add_months(c_date,-1)
into t_date
from dual;
END LOOP;
END;
- It can be extended with UTIL_FILE utility inside this procedure to write each query result to single/multiple files.
- SPOOL from SQL*plus for each query will be easy
- UNIX script to loop through each monthwise-query to load to file also possible
Upvotes: 0
Reputation: 36137
This will give all records from 1 year back to today:
SELECT * FROM reservations
WHERE date >= trunc( sysdate ) - interval '1' year
AND date < trunc( sysdate ) + interval '1' day
I want to run the above query with interval of 1 months,
I understand that you want to run this query 12 times, each time for another monthly period. If yes, then run this query 12 times changing the parameter X (within SELECT 1 As X FROM dual
subquery), beginning from 12 to 1 (or 1 to 12):
SELECT * FROM reservations
CROSS JOIN (
SELECT 1 As X FROM dual
) x
WHERE date >= trunc( sysdate ) - x * interval '1' month
AND date < trunc( sysdate ) + interval '1' day - ( x - 1 ) * interval '1' month
Upvotes: 1