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create table t1 (a tinyint unsigned not null, primary key(a)) engine='MYISAM' partition by key (a) ( partition pa1 max_rows=20 min_rows=2, partition pa2 max_rows=30 min_rows=3, partition pa3 max_rows=30 min_rows=4, partition pa4 max_rows=40 min_rows=2); show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` tinyint(3) unsigned NOT NULL, PRIMARY KEY (`a`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci PARTITION BY KEY (`a`) (PARTITION `pa1` MAX_ROWS = 20 MIN_ROWS = 2 ENGINE = MyISAM, PARTITION `pa2` MAX_ROWS = 30 MIN_ROWS = 3 ENGINE = MyISAM, PARTITION `pa3` MAX_ROWS = 30 MIN_ROWS = 4 ENGINE = MyISAM, PARTITION `pa4` MAX_ROWS = 40 MIN_ROWS = 2 ENGINE = MyISAM) insert into t1 values (255), (254), (253), (252), (1), (2), (128); select * from t1; a 1 128 2 252 253 254 255 select * from t1 where a=253; a 253 delete from t1 where a=253; select * from t1; a 1 128 2 252 254 255 drop table t1; create table t2 (a tinyint unsigned not null, primary key(a)) engine='MYISAM' partition by key (a) partitions 8; show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `a` tinyint(3) unsigned NOT NULL, PRIMARY KEY (`a`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci PARTITION BY KEY (`a`) PARTITIONS 8 insert into t2 values (255), (254), (253), (252); select * from t2; a 252 253 254 255 select * from t2 where a=253; a 253 delete from t2 where a=253; select * from t2; a 252 254 255 delete from t2; 255 inserts; select count(*) from t2; count(*) 255 drop table t2; create table t3 (a tinyint not null, primary key(a)) engine='MYISAM' partition by key (a) partitions 7; show create table t3; Table Create Table t3 CREATE TABLE `t3` ( `a` tinyint(4) NOT NULL, PRIMARY KEY (`a`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci PARTITION BY KEY (`a`) PARTITIONS 7 insert into t3 values (127), (126), (125), (124), (-128), (-127), (1), (-1), (0); select * from t3; a -1 -127 -128 0 1 124 125 126 127 select * from t3 where a=125; a 125 delete from t3 where a=125; select * from t3; a -1 -127 -128 0 1 124 126 127 drop table t3;