MySQL GET_FORMAT() not working as expecte

Hello,

I'm trying to update one datetime field based on other datetime filed that is bigger than 1 day than the other

This is my query:

UPDATE TABLE SET `field`='amyvalue' WHERE datetime_field < GET_FORMAT(UNIX_TIMESTAMP(`other_datetime_field`)-86400, 'ISO')


I'm getting this error:
Error Code : 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UNIX_TIMESTAMP(`other_datetime_field`)-86400, 'ISO')' at line 1


How can I use GET_FORMAT() to get it to work properly ?

Thank you
LVL 14
Ionut A. TudorPHP ProgrammerAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
what is the data type of datetime_field and other_datetime_field, please?if it's really datetime:http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.htmlhttp://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_date-add
UPDATE TABLE 
  SET `field`='amyvalue' 
WHERE datetime_field < date_sub(`other_datetime_field`, INTERVAL 1 DAY)

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Ionut A. TudorPHP ProgrammerAuthor Commented:
Yes angelll, I needed it for doing the below and it worked. Thanks

UPDATE orders SET `other_datetime_field`=DATE_SUB(`datetime_field`, INTERVAL 2 DAY) WHERE id='1' LIMIT 1

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