I am new to DB2, and I want to compare two dates, i.e., posted date with the expiry date. If posted date is more than seven days old, I need to archive that topic. Or if the current date is greater than expiry date, I need to archive that topic. How can I do the date comparisons in DB2? Is there any DB2-specific function for date comparisons?

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DB2 offers a wealth of functionality in terms of its date/time arithmetic support and date/time functions. I suggest you take a look at the "DB2 SQL Reference" manual available for download from IBM's Web site to read up on DB2's date/time support. To answer your specific question, though, the following query/predicate should return the rows where the posted date is greater than 7 days from the expiry date: 

SELECT COL1, COL2, ... 
FROM   YOUR_TABLE 
WHERE (POSTED_DATE + 7 DAYS) > EXPIRY_DATE;

This was first published in January 2003

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