How to count newest entries created in an oracle database

We will base the logic around sysdate which returns the current datetime, from which we substract different units. For example for the last day from now use sysdate - 1 (units default to day) and compare with the timestamp column (in this case CREATED_AT) :

select count(*)
from PARTNER
WHERE CREATED_AT > (sysdate - 1)

-- last 2 days would be
select count(*)
from PARTNER
WHERE CREATED_AT > (sysdate - 2)

From the last hour, respectively last two hours use the following commands, where 1/24 is the unit for hour:

-- last hour
select count(*)
from PARTNER
WHERE CREATED_AT > (sysdate - 1/24)

-- last 2 hours
select count(*)
from PARTNER
WHERE CREATED_AT > (sysdate - 2/24)

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