1SET DEFAULT_STORAGE_ENGINE='tokudb'; 2DROP TABLE IF EXISTS t1; 3create table t1(a int, b int, c int, d int, primary key(a), key(b) clustering=yes, key (c))engine=tokudb; 4insert into t1 values (1,1,1,1),(2,2,2,2),(3,3,3,3),(4,4,4,4),(5,5,5,5),(6,6,6,6),(7,7,7,7),(8,8,8,8),(9,9,9,9); 5explain select * from t1 where b > 2; 6id select_type table type possible_keys key key_len ref rows Extra 71 SIMPLE t1 range b b 5 NULL NULL; Using where; Using index 8explain select * from t1 where c > 2; 9id select_type table type possible_keys key key_len ref rows Extra 101 SIMPLE t1 ALL c NULL NULL NULL NULL; Using where 11explain select * from t1 where a > 4; 12id select_type table type possible_keys key key_len ref rows Extra 131 SIMPLE t1 range PRIMARY PRIMARY 4 NULL NULL; Using where 14explain select * from t1 where c > 7; 15id select_type table type possible_keys key key_len ref rows Extra 161 SIMPLE t1 range c c 5 NULL NULL; Using where 17explain select * from t1 where b > 7; 18id select_type table type possible_keys key key_len ref rows Extra 191 SIMPLE t1 range b b 5 NULL NULL; Using where; Using index 20explain select a from t1 where b > 0; 21id select_type table type possible_keys key key_len ref rows Extra 221 SIMPLE t1 index b b 5 NULL NULL; Using where; Using index 23explain select a from t1 where c > 0; 24id select_type table type possible_keys key key_len ref rows Extra 251 SIMPLE t1 index c c 5 NULL NULL; Using where; Using index 26drop table t1; 27