[Solved] How can I add “ON UPDATE CURRENT_TIMESTAMP” on a column at table creation or by alter table withoud defining its default value

by 


ALTER TABLE t1
  MODIFY COLUMN c1
  TIMESTAMP
  NULL -- the opposite is NOT NULL, which is implicitly set on timestamp columns
  DEFAULT NULL -- no default value for newly-inserted rows
  ON UPDATE CURRENT_TIMESTAMP;

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solved How can I add “ON UPDATE CURRENT_TIMESTAMP” on a column at table creation or by alter table withoud defining its default value