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select variable_name from information_schema.session_status where variable_name =
(select variable_name from information_schema.session_status where variable_name = 'uptime');
variable_name
UPTIME
select variable_name from information_schema.session_variables where variable_name =
(select variable_name from information_schema.session_variables where variable_name = 'basedir');
variable_name
BASEDIR
create table t1 (x int);
create table t2 (x int);
create table t3 (x int);
create table t4 AS select table_name from information_schema.TABLES where table_schema = database() and table_type = 'BASE TABLE' ;
delete from t4 where table_name not in (select table_name from information_schema.TABLES where table_schema = database() and table_type = 'BASE TABLE');
select * from t4;
table_name
t1
t2
t3
t4
drop table t1, t2, t3, t4;
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