This article has additional information about the ADD_DAYS SQL function.
For convertibility of this function, go to SQL functions A - C.
ADD_DAYS
Adds a specified number of days to a date.
Syntax
ADD_DAYS( date, number-of-days )
The required date must evaluate to a datetime. The required number-of-days must be an integer.
Example 1
UPDATE tab1
SET next_year = ADD_DAYS( SYSDATE, 365 )
Example 2
UPDATE schedtour
SET must_end = ADD_DAYS( start_date, 40 )
WHERE limited = 'Y'
Notes
This is a convertible function resolved by USoft and thus supported on all RDBMS platforms.
On Oracle and SQL Server, in additions and subtractions involving a date value and a numeric value, the numeric value is automatically converted to a date value (1 is interpreted as 1 day). On JDBC/Derby, ADD_DAYS must be used to achieve this conversion.