mysql - Change varchar m/d/yy to yyyy-mm-dd -

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i have varchar(9) column data in form m/d/yy. want convert yyyy-mm-dd. can select values , view changes using query, 

select str_to_date(date_new,'%m/%d/%y') date   july

my problem how update values in column. tried using query, messes dates.

update july    set date_new = str_to_date(date_new, '%d-%m-%y' );

any gladly accepted!

thank in advance. :)

you close. can use date_format() convert desired string representation.

update july    set date_new = date_format(str_to_date(date_new,'%m/%d/%y'), '%y-%m-%d');

note: you'd need change column varchar(9) varchar(10) fit reformatted values.

alter table july modify date_new varchar(10);

here sqlfiddle.


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