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create table t1 (a float 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` float 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 (-3.402823466E+38), (3.402823466E+38), (-1.5), (-1), (0), (1), (1.5); select * from t1; a -3.40282e38 -1.5 -1 0 1 1.5 3.40282e38 select * from t1 where a=1.5; a 1.5 delete from t1 where a=1.5; select * from t1; a -3.40282e38 -1.5 -1 0 1 3.40282e38 drop table t1; create table t2 (a float not null, primary key(a)) engine='MYISAM' partition by key (a) partitions 10; show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `a` float NOT NULL, PRIMARY KEY (`a`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci PARTITION BY KEY (`a`) PARTITIONS 10 insert into t2 values (-3.402823466E+38), (-3.402823466E+37), (-123.456), (0), (1234546.789), (123.456), (1.5); select * from t2; a -3.40282e38 -3.40282e37 -123.456 0 1.5 123.456 1234550 select * from t2 where a=123.456; a delete from t2 where a=123.456; select * from t2; a -3.40282e38 -3.40282e37 -123.456 0 1.5 123.456 1234550 select * from t2 where a=1.5; a 1.5 delete from t2 where a=1.5; select * from t2; a -3.40282e38 -3.40282e37 -123.456 0 123.456 1234550 delete from t2; 16384*3 inserts; select count(*) from t2; count(*) 49152 drop table t2;