Converting timestamp from one column of an SQL table to dates in another column of the same table

I’d like to convert unix timestamps from one column of an existing sql table to dates in another column of the same table. Something like this: take the values of column TIMESTAMP from every raw and convert it into a date and put it into column DATE.

I already figure out that the below expression converts the timestamps into dates:

SELECT FROM_UNIXTIME(TIMESTAMP) FROM MYTABLE

but I don’t know how to plug this into a normal sql update expression.

Thanks for any advice!
W

Answer

Use the expression in the SET clause of the UPDATE query.

UPDATE MYTABLE 
SET date = FROM_UNIXTIME(timestamp)