oracle systimestamp (sysdate) to milliseconds

Question

Could you provide implementation of stored function to get current systimestamp as milliseconds.
Something I can use like

select current_tim         


        

Answer 1

Adding to @Mykhaylo Adamovych answer (which looks correct!) here goes a more straightforward approach using oracle Java support (i.e. not in XE and not in AWS RDS). Less portable (in case you care), but seemed faster in my testing.

CREATE or replace FUNCTION current_java_timestamp RETURN number
AS LANGUAGE JAVA NAME 'java.lang.System.currentTimeMillis() return java.lang.Long';
/