Redshift Timestamp Trailing Zeros

The timestamp is stored in Redshift typically would not loose the precision. Depending the tool you use to display the results of the SQL data, the formatting may be showing 2 decimal places as default unless you have more than 2 non zero decimal places.

Try this to display 3 or 6 digits:

select id,created_dt,
to_char(created_dt, 'HH24:MI:SS') as seconds,
to_char(created_dt, 'HH24:MI:SS.MS') as milliseconds,
to_char(created_dt, 'HH24:MI:SS:US') as microseconds;