drop table if exists t1; CREATE TABLE t1 ( a int unsigned NOT NULL PRIMARY KEY, b int unsigned not null, c int unsigned, KEY(b) ) engine=ndbcluster; insert t1 values(1, 2, 3), (2,3, 5), (3, 4, 6), (4, 5, 8), (5,6, 2), (6,7, 2); select * from t1 order by b; a b c 1 2 3 2 3 5 3 4 6 4 5 8 5 6 2 6 7 2 select * from t1 where b >= 4 order by b; a b c 3 4 6 4 5 8 5 6 2 6 7 2 select * from t1 where b = 4 order by b; a b c 3 4 6 select * from t1 where b > 4 order by b; a b c 4 5 8 5 6 2 6 7 2 select * from t1 where b < 4 order by b; a b c 1 2 3 2 3 5 select * from t1 where b <= 4 order by b; a b c 1 2 3 2 3 5 3 4 6 update t1 set c = 3 where b = 3; select * from t1 order by a; a b c 1 2 3 2 3 3 3 4 6 4 5 8 5 6 2 6 7 2 update t1 set c = 10 where b >= 6; select * from t1 order by a; a b c 1 2 3 2 3 3 3 4 6 4 5 8 5 6 10 6 7 10 update t1 set c = 11 where b < 5; select * from t1 order by a; a b c 1 2 11 2 3 11 3 4 11 4 5 8 5 6 10 6 7 10 update t1 set c = 12 where b > 0; select * from t1 order by a; a b c 1 2 12 2 3 12 3 4 12 4 5 12 5 6 12 6 7 12 update t1 set c = 13 where b <= 3; select * from t1 order by a; a b c 1 2 13 2 3 13 3 4 12 4 5 12 5 6 12 6 7 12 drop table t1; CREATE TABLE t1 ( a int unsigned NOT NULL PRIMARY KEY, b int unsigned not null, c int unsigned, KEY(b) ) engine=ndbcluster; insert t1 values(1, 2, 13), (2,3, 13), (3, 4, 12), (4, 5, 12), (5,6, 12), (6,7, 12); delete from t1 where b = 3; select * from t1 order by a; a b c 1 2 13 3 4 12 4 5 12 5 6 12 6 7 12 delete from t1 where b >= 6; select * from t1 order by a; a b c 1 2 13 3 4 12 4 5 12 delete from t1 where b < 4; select * from t1 order by a; a b c 3 4 12 4 5 12 delete from t1 where b > 5; select * from t1 order by a; a b c 3 4 12 4 5 12 delete from t1 where b <= 4; select * from t1 order by a; a b c 4 5 12 drop table t1; CREATE TABLE t1 ( a int unsigned NOT NULL PRIMARY KEY, b int unsigned not null, c int unsigned not null ) engine = ndb; create index a1 on t1 (b, c); insert into t1 values (1, 2, 13); insert into t1 values (2,3, 13); insert into t1 values (3, 4, 12); insert into t1 values (4, 5, 12); insert into t1 values (5,6, 12); insert into t1 values (6,7, 12); insert into t1 values (7, 2, 1); insert into t1 values (8,3, 6); insert into t1 values (9, 4, 12); insert into t1 values (14, 5, 4); insert into t1 values (15,5,5); insert into t1 values (16,5, 6); insert into t1 values (17,4,4); insert into t1 values (18,1, 7); select * from t1 order by a; a b c 1 2 13 2 3 13 3 4 12 4 5 12 5 6 12 6 7 12 7 2 1 8 3 6 9 4 12 14 5 4 15 5 5 16 5 6 17 4 4 18 1 7 select * from t1 where b<=5 order by a; a b c 1 2 13 2 3 13 3 4 12 4 5 12 7 2 1 8 3 6 9 4 12 14 5 4 15 5 5 16 5 6 17 4 4 18 1 7 select * from t1 where b<=5 and c=0; a b c insert into t1 values (19,4, 0); select * from t1 where b<=5 and c=0; a b c 19 4 0 select * from t1 where b=4 and c<=5 order by a; a b c 17 4 4 19 4 0 select * from t1 where b<=4 and c<=5 order by a; a b c 7 2 1 17 4 4 19 4 0 select * from t1 where b<=5 and c=0 or b<=5 and c=2; a b c 19 4 0 drop table t1;