Oracle TimesTen Getting Unixtime or Seconds Since the Epoch UTC

On normal oracle databases, you can run a simple sql query subtracting the epoch date from sysdate. This doesn't work for TimesTen as you will get an error mentioning 'An interval data type must be specified for a datetime arithmetic result.' The easiest work around is to cast the subtraction as a bigint and divide by 1000000

On TimesTen - sql 
select cast((sysdate - to_date('1970-01-01 00:00:00','YYYY-MM-DD HH24:MI:SS')) as bigint)/1000000 from dual 

On conventional oracle database - sql 
select (sysdate - to_date('1970-01-01 00:00:00','YYYY-MM-DD HH24:MI:SS')) * 86400 from dual


Anonymous said...

For future readers - the division is to deal with the Oracle timestamp being recorded in microseconds, where epoch is in seconds.

1 million ought to do it (rather than the hundred thousand stated or the ten million in the code)

Naviya Nair said...

Very interesting and good Explanation
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