datetime - MySQL: Add 30 days to a value in the table -

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I am trying to use the ADDDATE function on a value in the table. 

  addOns = ADDDATE (addOns, INTERVAL 30)   
 is addOns where I can not add 30 days where I store datetime / Can i          
 Updated credit SET addOns = ADDDATE (addOns, INTERVAL 30 DAY) - or updated credit SET addOns = ADDDATE (addOns, 30) 
 
  / Code>

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