Increments of a date using Oracle SQL -

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We send mailouts using SQL each evening. Especially we want to send a reminder every 3 days, but I do not know at all how to do this, or even if it is possible?

Here is my code: 

 from the  SELECT * table WHERE condition = 'pending' and (date_created = sysdate - 3 or date_created = sysdate - 6 or date_created = sysdate - 9)   
 Something in that effect, but it is a good way of coding and it is also more effective than I will not need to go to hundreds! ^ _ ^  
 thanks   
 
 
 Try  
 < Info on code> Oracle MOD:    from the table * Position = 'pending' and 'm.o. (sysdate-date_created, 3) = 0

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