drop table if exists t1;
create table t1 (kill_id int);
insert into t1 values(connection_id());
select ((@id := kill_id) - kill_id) from t1;
((@id := kill_id) - kill_id)
0
kill @id;
select 1;
Got one of the listed errors
select ((@id := kill_id) - kill_id) from t1;
((@id := kill_id) - kill_id)
0
select @id != connection_id();
@id != connection_id()
1
select 4;
4
4
drop table t1;