SQL Fill empty query with 0 based on date range - sql

Question

I have the following Oracle SQL query results:
TDATE OPEN Closed
19/05/15 1 1
20/05/15 0 1
26/05/15 2 0
27/05/15 1 0
28/05/15 2 0
For example I would like to query from the 19 - 30 May.
And the results i would like to get is:
TDATE OPEN Closed
19/05/15 1 1
20/05/15 0 1
21/05/15 0 0
22/05/15 0 0
23/05/15 0 0
24/05/15 0 0
25/05/15 0 0
26/05/15 2 0
27/05/15 1 0
28/05/15 2 0
29/05/15 0 0
30/05/15 0 0
Where the query is within the date range and records that do not exist will be returned as 0 and 0 for Open and Closed.
Any help would be appreciated.

Answer 1

An empty table with zeroes and all the dates could be made as
INSERT INTO empytable
(SELECT TRUNC(#firstdat + (ROWNUM - 1)) dat, 0, 0
FROM DUAL CONNECT BY ROWNUM <= #days)
Then you can load your results into this table, or combine them otherwise.
The placeholder firstdat should be a date for the addition to work.

Answer 2

In Oracle, using CTE,
WITH table_ (TDATE, OPEN, Closed) AS (
SELECT to_date('19/05/15', 'dd/mm/yy'), 1, 1 from dual UNION ALL
SELECT to_date('20/05/15', 'dd/mm/yy'), 0, 1 from dual UNION ALL
SELECT to_date('26/05/15', 'dd/mm/yy'), 2, 0 from dual UNION ALL
SELECT to_date('27/05/15', 'dd/mm/yy'), 1, 0 from dual UNION ALL
SELECT to_date('28/05/15', 'dd/mm/yy'), 2, 0 from dual),
--------------
-- End of data preparation
--------------
arr_table as (
select to_date('19/05/15', 'dd/mm/yy') + level - 1 dummy_date
from dual
connect by ROWNUM < = to_date('28/05/15', 'dd/mm/yy') - to_date('19/05/15', 'dd/mm/yy') + 1)
SELECT a.dummy_date, COALESCE( b.open, 0) AS OPEN, COALESCE( b.closed, 0) AS closed
FROM arr_table a
LEFT OUTER JOIN table_ b
ON b.tdate = a.dummy_date
ORDER BY a.dummy_date;
Output:
| DUMMY_DATE | OPEN | CLOSED |
|-----------------------|------|--------|
| May, 19 2015 00:00:00 | 1 | 1 |
| May, 20 2015 00:00:00 | 0 | 1 |
| May, 21 2015 00:00:00 | 0 | 0 |
| May, 22 2015 00:00:00 | 0 | 0 |
| May, 23 2015 00:00:00 | 0 | 0 |
| May, 24 2015 00:00:00 | 0 | 0 |
| May, 25 2015 00:00:00 | 0 | 0 |
| May, 26 2015 00:00:00 | 2 | 0 |
| May, 27 2015 00:00:00 | 1 | 0 |
| May, 28 2015 00:00:00 | 2 | 0 |
So basically, the query will be :
with arr_table as (
select to_date(<start_date>, 'dd/mm/yy') + level - 1 dummy_date
from dual
connect by ROWNUM < = to_date(<end_date>, 'dd/mm/yy') - to_date(<start_date>, 'dd/mm/yy') + 1)
SELECT a.dummy_date, COALESCE( b.open, 0) AS OPEN, COALESCE( b.closed, 0) AS closed
FROM arr_table a
LEFT OUTER JOIN <your_table> b
ON b.tdate = a.dummy_date
ORDER BY a.dummy_date;