Oracle Set operator query - sql

Question

Have a SQL query on Oracle 11g which returns the count of whether a record having certain ID and status exists within +/- 15 minutes range in a table.
Now I wish to ignore the current date by adding a condition like AND TIMESTAMP < trunc(sysdate).
However, for cases where the record exists in todays date I wish to ignore the date comparison check in the query '2010-07-20 19:15:11' >= TO_CHAR(TIMESTAMP - (1/1440*15), 'YYYY-MM-DD HH24:MI:SS')
AND '2010-07-20 19:15:11' <= (TO_CHAR(TIMESTAMP + (1/1440*15), 'YYYY-MM-DD HH24:MI:SS'))
SELECT count(1) AS COUNT
FROM MASTER_ONE
WHERE ID='123' AND STATUS= 'ACTIVE'
AND '2010-07-20 19:15:11' >= TO_CHAR(TIMESTAMP - (1/1440*15), 'YYYY-MM-DD HH24:MI:SS')
AND '2010-07-20 19:15:11' <= (TO_CHAR(TIMESTAMP + (1/1440*15), 'YYYY-MM-DD HH24:MI:SS'))
UNION ALL
SELECT count(1) AS COUNT
FROM MASTER_TWO
WHERE ID='321' AND STATUS= 'ACTIVE'
AND '2010-07-20 19:15:11' >= TO_CHAR(TIMESTAMP - (1/1440*15), 'YYYY-MM-DD HH24:MI:SS')
AND '2010-07-20 19:15:11' <= (TO_CHAR(TIMESTAMP + (1/1440*15), 'YYYY-MM-DD HH24:MI:SS'))
How do I do this?

Answer 1

The first problem with your query is that you're doing a string comparison on the date. Use to_date instead of to_char and let Oracle help you out.
SELECT
to_date('2010-07-20 19:15:11', 'YYYY-MM-DD HH24:MI:SS') AS orig_date
, to_date('2010-07-20 19:15:11', 'YYYY-MM-DD HH24:MI:SS') - 1 / 24 / 4 AS fifteen_min_prior
, to_date('2010-07-20 19:15:11', 'YYYY-MM-DD HH24:MI:SS') + 1 / 24 / 4 AS fifteen_min_after
FROM dual;
Output:
ORIG_DATE FIFTEEN_MIN_PRIOR FIFTEEN_MIN_AFTER
------------------------- ------------------------- -------------------------
20-JUL-10 07:15:11 PM 20-JUL-10 07:00:11 PM 20-JUL-10 07:30:11 PM
Then use can use those dates in a BETWEEN condition in the predicate. See Oracle date "Between" Query.
I'm not quite clear what you mean by "However, for cases where the record exists in todays date I wish to ignore the date comparison check in the query." You'd just written that you want to exclude values from the current day. Either you're excluding today's records or you're not.

Answer 2

Ok, you can try something like this, if I understood you correctly:
SELECT count(1) AS COUNT
FROM MASTER_ONE
WHERE ID='123' AND STATUS= 'ACTIVE'
AND (timestamp > trunc(sysdate)
OR (timestamp < trunc(sysdate)
AND timestamp BETWEEN to_date(:yourInputDate,'DD/MM/YYYY HH24:MI:SS') - (1/1440*15)
AND to_date(:yourInputDate,'DD/MM/YYYY HH24:MI:SS') + (1/1440*15)))
UNION ALL
SELECT count(1) AS COUNT
FROM MASTER_TWO
WHERE ID='321' AND STATUS= 'ACTIVE'
AND (timestamp > trunc(sysdate)
OR (timestamp < trunc(sysdate)
AND timestamp BETWEEN to_date(:yourInputDate,'DD/MM/YYYY HH24:MI:SS') - (1/1440*15)
AND to_date(:yourInputDate,'DD/MM/YYYY HH24:MI:SS') + (1/1440*15)))
In this Select, you only apply the 15 minutes condition if your timestamp column has a date prior to sysdate.