How to select at once?

Oracle DB 12 c

I have a table with a column of DATE (among others). I want to select lines just by comparing the time part.

I tried what follows, but gave me the correct result (working_start_time is the DATE column)

select to_char(working_start_time,'MMDDYYYY HH:MI AM'),a.* from sch_availability a
where working_start_time >= to_date('08:00 AM','HH:MI AM');


select to_char(working_start_time,'MMDDYYYY HH:MI AM'),a.* from sch_availability a
where to_char(working_start_time,'HH:MI AM') >= '08:00 AM';

So how to find all the lines where the time is higher at 08:00 (regardless the date)?

If you are concerned only with verification against a time of day for example (08:00) 8, here are 3 methods:

with the data as)

Select sysdate - 5 * dbms_random.normal dte

of the double

connect by level<=>

)

Select to_char (dte,'dd.mm.yyyy hh: mi AM') dte.

excerpt from hour_of_day1 ((dte as timestamp) cast time).

trunc ((dte - trunc (dte)) * 24) hour_of_day2,.

TO_NUMBER (to_char (dte, 'hh24')) hour_of_day3

from the data

Just move whatever one you prefer in your where clause.

DTE HOUR_OF_DAY1 HOUR_OF_DAY2 HOUR_OF_DAY3
09.12.2015 05:53 5 5 5
28.11.2015 21:48 21 21 21
10.12.2015 03:12 3 3 3
28.11.2015 12:02 AM 0 0 0
06.12.2015 18:42 18 18 18
05.12.2015 23:01 23 23 23
06.12.2015 06:23 6 6 6
06.12.2015 11:39 11 11 11
10.12.2015 11:30 11 11 11
05.12.2015 13:32 13 13 13
10.12.2015 04:15 4 4 4
03.12.2015 09:13 9 9 9
11.12.2015 20:14 20 20 20
09.12.2015 02:14 2 2 2
27.11.2015 13:35 13 13 13
10.12.2015 14:47 14 14 14
26.11.2015 07:39 7 7 7

17 selected lines.

Tags: Database

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