1select variable_name from information_schema.session_status where variable_name =
2(select variable_name from information_schema.session_status where variable_name = 'uptime');
3variable_name
4UPTIME
5select variable_name from information_schema.session_variables where variable_name =
6(select variable_name from information_schema.session_variables where variable_name = 'basedir');
7variable_name
8BASEDIR
9create table t1 (x int);
10create table t2 (x int);
11create table t3 (x int);
12create table t4 AS select table_name from information_schema.TABLES where table_schema = database() and table_type = 'BASE TABLE' ;
13delete from t4 where table_name not in (select table_name from information_schema.TABLES where table_schema = database() and table_type = 'BASE TABLE');
14select * from t4 order by table_name;
15table_name
16t1
17t2
18t3
19t4
20drop table t1, t2, t3, t4;
21