Can we combine this into one query, just curious

Question

Dear all;
I have a query of the following form
select t.id, t.place  from tbl_one t
where t.create_date < sysdateand
select t.id, t.place  from tbl_one t
where t.create_date < sysdate + 28just curious, can those two queries be combined to one. Thank you. All help is appreciated.

Answer 1

Is this a trick question? You could combine the two queries using AND / OR clause but it wouldn't really solve anything.
Lets look at each query.
SELECT t.id, t.place FROM tbl_one t WHERE t.create_date < sysdateThe above query would return all records whose create_date is older than sysdate (now).
SELECT t.id, t.place FROM tbl_one t WHERE t.create_date < sysdate OR t.create_date < sysdate + 28The above query would return all records whose create_date is older than sysdate (now) OR records whose create_date is older than sysdate (now) + 28 (or 28 increments in the future). These two queries are the same because if create_date is older than sysdate (now) by default it is older than any time future time. And since OR clause only requires one condition to be true sysdate+28 is unnecessary.
Similarly, we could combine the two queries using the AND clause.
SELECT t.id, t.place FROM tbl_one t WHERE t.create_date < sysdate AND t.create_date < sysdate + 28The above query would return all records whose create_date is older than sysdate AND older than sysdate+28. However, since the AND clause requires both conditions to be true, and since all sysdate +28 > sysdate the above query is equal to
SELECT t.id, t.place FROM tbl_one t WHERE t.create_date < sysdate + 28Basically you COULD combined the two select statements but it would be pointless