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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 4;
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drop table t1;
select get_lock("a", 10);
get_lock("a", 10)
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select get_lock("a", 10);
get_lock("a", 10)
NULL
select 1;
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select RELEASE_LOCK("a");
RELEASE_LOCK("a")
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