add a year to existing date and update all records

I am trying to figure out how to take all the current dates in the field called dateCreated in the table clientRecords then add a year to dateCreated and update the field dateExpired in mySQL
stargateatlantisAsked:
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gnoonCommented:
-- firstly, backup the table
insert into clientRecords_bck select * from clientRecords;

-- then update value of dateExpired field, +3 years for example
update clientRecords set dateExpired=dateCreated+interval 3 year
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nemws1Database AdministratorCommented:
Not sure why gnoon is adding *three* years.  But yes, back up your data, as always, although I usually use 'mysqldump' instead of creating another table:
 
mysqldump dbname clientRecords > clientRecords.sql

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And then use UPDATE and DATE_ADD to add one year:
 
UPDATE clientRecords
SET dateExpired=DATE_ADD(dateCreated, INTERVAL 1 YEAR)
;

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MySQL Server

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