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Add years to an Oracle date

Expert Oracle Database Tips by Donald BurlesonMarch 15, 2015

 

Question:  I need a SQL statement to identify all rows that are more than two years old and set my status flag based on my DATE column.

Is there a minus_years function in Oracle SQL? 

If not, how can I make a SQL function to subtract two years in my WHERE clause? 

Can I use the add_years built-in function (BIF)?

Answer: Because Oracle is so flexible, there are several ways to satisfy your request using date functions.   

Also note here on how to do Oracle arithmetic functions and you can also use date functions when scheduling jobs.  

This primitive example demonstrates the concept, but it will not always work because leap years will have 366 days:

update
    mytab
set
    status='OLD"
where trunc(sysdate) < myrow_date -(365*2)

A correct solution would use the add_years BIF, something like this:

update
    mytab
set
    status='OLD"
where trunc(sysdate) < (myrow_date - add_years(myrow_date,2));

You might also use the add_months function to subtract two years, something like this:

update
    mytab
set
    status='OLD"
where trunc(sysdate) < (myrow_date - add_months(trunc(myrow_date),12*32));  

Again, there are many other ways to add and subtract years . . .

 

 
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