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

Try this query -

ALTER TABLE table_name
  CHANGE COLUMN column_name column_name TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;

Note, in the table only one field can be with 'ON UPDATE CURRENT_TIMESTAMP' option.