How to add “ON update current timestamp” to existing table column

Question

i have column say ts_activity with datatype timestamp in MYSQL and default value to current timestamp. I want to add on update apply current time stamp to this column value.

Answer 1

Devart's suggestion will work, but I prefer to use MODIFY COLUMN instead of CHANGE COLUMN if I'm not renaming the column.

I also assume that your ts_activity column is not nullable since you have a default, so I am setting it to NOT NULL, but that's up to you.

This is the statement I would use:

ALTER TABLE your_table
  MODIFY COLUMN ts_activity TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;