Question

I have two fields:

last_modified : datetime
updated_at    : timestamp

updated_at is a new field which has just been added to the table, last_modified contains accurate dates.

I want to be able to loop through all of the rows in the table, selecting the last_modifed datetime, converting it into a timestamp and saving it in the new updated_at field.

Have no idea how to do this, any help is much appreciated!

Answer 1

Try

update table_name set updated_at=unix_timestamp(last_modified);

I don’t why you want to store same data twice. Storing same data twice may result into inconsistency.

If you want timestamp in your code, you can do that in code itself.