sql - MySQL update with date manipulation from other field -


i have mysql table:

fields:  tag duedate

in "tag" field have string conatining date ("mywhatever_20130401").

all rows "tag" "mywhatever_%", need update "duedate" using "20130401" "tag" , adding 14 days , store in format "2013-04-15".

any way 1 query?

you can use right() function trim characters string based on specified length. before can add 14 days string, need convert first date using str_to_date(), eg.

update  tablename set     duedate = str_to_date(right(tag, 8),'%y%m%d') + interval 14 day   tag 'mywhatever\_%'

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