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Number of seconds since a certain date in Oracle

Is there any way to convert sysdate to the number of seconds since Jan 01, 1970?

Here, we simply subtract our specific date from Oracle's SYSDATE to find the number of days between the two dates. There are 24 hours in a day, 60 minutes in an hour, and 60 seconds in a minute, and so to find the number of seconds, we multiply the number of days by the product of these three numbers. Here's the SQL:

select (sysdate - cast('01-JAN-1970' as date)) * 86400 
  from dual;

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