Littlefoot
2020-11-30 16:57:19
If you subtract 1 from a date datatype (e.g. sysdate), it'll move you back one day. But, if you subtract it from a timestamp datatype value, Oracle will convert it to date and return a date (moreover, it'll be truncated).
See the following example:
SQL> select
2 systimestamp val1,
3 systimestamp - 1 val2,
4 --
5 systimestamp - interval '1' day val3
6 from dual;
VAL1
-----------------------------------------------------
VAL2
--------
VAL3
-----------------------------------------------------
30.11.20 09:55:01,439352 +01:00
29.11.20
29.11.20 09:55:01,439352000 +01:00
SQL>
So, what you should do is to subtract an interval, i.e.
select *
from user
where created_date < systimestamp - interval '1' day;
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6
It won't be truncated as per the
TRUNCfunction; it will just lose the fractional seconds. The rest of the time part of the timestamp will still be present. The OP's NLS (or IDE) settings are just not displaying the time component.