Column with exact date and time of recording - sql

Question

How to Add to a Database Table the Exact Date and Time, Adding a New Record to this Table
SELECT * FROM test;
ID NAME DT
---------- ---------- ----------
1 Ana 01.01.2019 00:00:00
2 Ina 01.01.2019 00:00:00
I want the exact time when this one was created
example:
ID NAME DT
---------- ---------- ----------
1 Ana 01.01.2019 10:41:22
2 Ina 01.01.2019 10:45:17
CREATE TABLE table
(
Id NUMBER(10),
Name varcahar2(10),
DT date
);

Answer 1

CREATE TABLE test
(
Id NUMBER(10),
Name varchar2(10),
DT date
);
Insert data:
INSERT INTO test values (1, 'Ana', sysdate);
INSERT INTO test values (2, 'Ina', sysdate);
COMMIT;
Query results:
SELECT id, name, TO_CHAR(dt, 'dd.mm.yyyy hh24:mi:ss') FROM test;
ID NAME TO_CHAR(DT,'DD.MM.Y
---------- ---------- -------------------
1 Ana 02.09.2019 10:07:18
2 Ina 02.09.2019 10:07:18

Answer 2

Oracle Setup:
CREATE TABLE table_name(
Id NUMBER(10),
Name VARCHAR2(10),
DT DATE
);
Option 1:
Use a DATE and INTERVAL literals:
INSERT INTO table_name ( id, name, dt )
VALUES ( 1, 'Ana', DATE '2019-01-01' + INTERVAL '10:41:22' HOUR TO SECOND );
Option 2:
Use TO_DATE and convert from a string:
INSERT INTO table_name ( id, name, dt )
VALUES ( 2, 'Ina', TO_DATE( '2019-01-01 10:45:17', 'YYYY-MM-DD HH24:MI:SS' ) );
Option 3:
Use a TIMESTAMP literal:
INSERT INTO table_name ( id, name, dt )
VALUES ( 3, 'Ona', TIMESTAMP '2019-01-01 10:49:12' );
Option 4:
If you want the current date & time then use SYSDATE:
INSERT INTO table_name ( id, name, dt )
VALUES ( 4, 'Una', SYSDATE );
or CURRENT_DATE:
INSERT INTO table_name ( id, name, dt )
VALUES ( 4, 'Una', CURRENT_DATE );
Output:
ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS';
SELECT * FROM table_name;
or
SELECT id, name, TO_CHAR( dt, 'YYYY-MM-DD HH24:MI:SS' ) AS dt FROM table_name;
Outputs:
ID | NAME | DT
-: | :--- | :------------------
1 | Ana | 2019-01-01 10:41:22
2 | Ina | 2019-01-01 10:45:17
3 | Ona | 2019-01-01 10:49:12
4 | Una | 2019-09-02 09:22:28
db<>fiddle here

Answer 3

use TIMESTAMP
CREATE TABLE table
(
Id NUMBER(10),
Name varchar2(10),
DT TIMESTAMP
);

Answer 4

Insert current date with your data, and use analytical function to compare time since last event.
CREATE TABLE so_test
(
Id NUMBER(10),
Name varchar2(10),
DT date
);
insert into so_test values (1, 'Scott', sysdate);
insert into so_test values (2, 'Andrii', sysdate);
insert into so_test values (3, 'Zaynul', sysdate);
select id, name, dt
,round((dt-LAG(dt) OVER (ORDER BY id))*86400) seconds_diff
from so_test
ID NAME DT SECONDS_DIFF
---------- ---------- ------------------- ------------
1 Scott 02-09-2019 16:02:47
2 Andrii 02-09-2019 16:02:58 11
3 Zaynul 02-09-2019 16:03:12 14