What is the Difference Between Sys Date and Effective Date ??

Hi Gurus,
Can any one pls let me know What is the Difference Between Sys Date and Effective Date ??
with regards
User600722

EFFECTIVE DATE usually refers to a date-tracked record (although not exclusively).
Date-tracked records in Oracle HR have an EFFECTIVE START DATE and an EFFECTIVE END DATE. The record is 'EFFECTIVE' between these dates. In reports, you often use SYSDATE to compare to these two dates to find the CURRENT effective record, e.g. SYSDATE BETWEEN EFFECTIVE START DATE AND EFFECTIVE END DATE.
When you make changes to a HR record, you can choose between DATE TRACKING options, such as CORRECT or UPDATE (there are others too). CORRECT will overwrite the record and replace the data with your changes. This is normally used when you need to correct something that is wrong. UPDATE will create a new version of the record from the EFFECTIVE START DATE you choose. It will also set the EFFECTIVE END DATE of the previous record to the day before your new record's EFFECTIVE START DATE. That enables a history of records to be maintained so you can see what your data looked like at ay one point in time.
Regards
Tim
Edited by: TimW on Sep 23, 2008 2:37 PM

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