How can I update column with type TIMESTAMP in Oracle via sql query?

Insert:

insert into tablename (LASTTOUCH) values (CURRENT_TIMESTAMP);

Update:

update tablename set LASTTOUCH=CURRENT_TIMESTAMP;

If you want the current time (including the timestamp precision), you could use either systimestamp or current_timestamp

SQL> select systimestamp from dual;SYSTIMESTAMP---------------------------------------------------------------------------04-OCT-12 11.39.37.670428 AM -04:00SQL> select CURRENT_TIMESTAMP from dual;CURRENT_TIMESTAMP---------------------------------------------------------------------------04-OCT-12 11.39.51.021937 AM -04:00update table_name set column_name = SYSTIMESTAMP where id = 100;

If you just set the value to sysdate, the fractional seconds part of the timestamp is zeroed out as the date is implicitly converted to timestamp.

SQL> create table t1(  2     time1 timestamp  3  );Table created.SQL> insert into t1 values (sysdate);1 row created.SQL> commit;SQL> select to_char(time1,'MM/DD/YYYY HH24:MI:SS.FF6') result from t1;RESULT-----------------------------10/04/2012 11:43:07.000000

INSERT INTO tableName VALUES (SYSDATE);

OR

UPDATE tableName SET COLUMN = SYSDATE;