drop table if exists t1;
create table t1(objid BIGINT not null, tablename  varchar(64), oid BIGINT not null, test BIGINT,  PRIMARY KEY (objid), UNIQUE(tablename))  engine=BDB;
insert into t1 values(1, 't1',4,9);
insert into t1 values(2, 'metatable',1,9);
insert into t1 values(3, 'metaindex',1,9 );
select * from t1;
objid	tablename	oid	test
1	t1	4	9
2	metatable	1	9
3	metaindex	1	9
alter table t1 drop column test;