DROP TABLE IF EXISTS t1;
create table t1 ( a int primary key, b varchar(10), c varchar(10), index (b) )
engine=ndb;
insert into t1 values (1,'one','one'), (2,'two','two'), (3,'three','three');
create index c on t1(c);
show indexes from t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
t1	0	PRIMARY	1	a	A	3	NULL	NULL		BTREE	
t1	1	b	1	b	A	3	NULL	NULL	YES	BTREE	
t1	1	c	1	c	A	3	NULL	NULL	YES	BTREE	
select * from t1 where c = 'two';
a	b	c
2	two	two
alter table t1 drop index c;
show indexes from t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
t1	0	PRIMARY	1	a	A	3	NULL	NULL		BTREE	
t1	1	b	1	b	A	3	NULL	NULL	YES	BTREE	
select * from t1 where c = 'two';
a	b	c
2	two	two
drop table t1;
create table t3 (a int primary key) engine=ndbcluster;
begin;
insert into t3 values (1);
alter table t3 rename t4;
commit;
select * from t3;
ERROR 42S02: Table 'test.t3' doesn't exist
select * from t4;
a
1
drop table t4;
show tables;
Tables_in_test