drop database if exists time_on_update_db;
create database time_on_update_db;
use time_on_update_db;

create table ts(c1 int primary key, c2 timestamp default current_timestamp on update current_timestamp, c3 int);
create table t1(c1 int primary key, c2 int);
create table t2(c1 int primary key, c2 int, c3 varchar(32));

# same result
update ts set c3=c1+10, c2=now();
update ts set c3=c1+10;

# same result
insert into ts(c1, c3) values(1, 11) on duplicate key update c3=5, c2=now();
insert into ts(c1, c3) values(1, 11) on duplicate key update c3=5

drop database time_on_update_db;