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drop table if exists t1; CREATE TABLE t1 ( ol_o_id int NOT NULL, ol_d_id int NOT NULL, ol_w_id int NOT NULL, ol_number int NOT NULL, ol_tmp int, PRIMARY KEY (ol_w_id, ol_d_id, ol_o_id, ol_number) ) ENGINE=NDB PARTITION BY HASH (ol_w_id); insert into t1 values (1,0,0,0,0),(1,0,0,1,0),(1,0,0,2,0),(1,1,0,0,0),(1,1,0,1,0); insert into t1 values (2,0,0,0,0),(4,0,0,0,0),(4,0,0,1,0); insert into t1 values (0,1,1,4,0),(0,1,1,5,0); UPDATE t1 force index (primary) SET ol_tmp = 1 WHERE ol_o_id = 0 AND ol_d_id = 1 AND ol_w_id = 1; ndb_scan_count 1 ndb_pruned_scan_count 1 SELECT * FROM t1 WHERE ol_w_id = 1 AND ol_d_id = 1 AND ol_o_id = 0; ol_o_id ol_d_id ol_w_id ol_number ol_tmp 0 1 1 4 1 0 1 1 5 1 ndb_scan_count 1 ndb_pruned_scan_count 1 SELECT SUM(ol_number) FROM t1 WHERE ol_o_id = 0 AND ol_w_id = 1 AND ol_d_id = 1; SUM(ol_number) 9 ndb_scan_count 1 ndb_pruned_scan_count 1 drop table t1;