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DROP TABLE IF EXISTS t2; CREATE TABLE t2 ( a bigint unsigned NOT NULL PRIMARY KEY, b int unsigned not null, c int unsigned ) engine=ndbcluster; select count(*) from t2; count(*) 10000 delete from t2 limit 1; select count(*) from t2; count(*) 9999 delete from t2 limit 100; select count(*) from t2; count(*) 9899 delete from t2 limit 1000; select count(*) from t2; count(*) 8899 update t2 set c=12345678 limit 100; select count(*) from t2 where c=12345678; count(*) 100 select count(*) from t2 where c=12345678 limit 1000; count(*) 100 select * from t2 limit 0; a b c drop table t2; CREATE TABLE `t2` ( `views` int(11) NOT NULL default '0', `clicks` int(11) NOT NULL default '0', `day` date NOT NULL, `hour` tinyint(4) NOT NULL default '0', `bannerid` smallint(6) NOT NULL default '0', `zoneid` smallint(6) NOT NULL default '0', `source` varchar(50) NOT NULL default '', PRIMARY KEY (`day`,`hour`,`bannerid`,`zoneid`,`source`), KEY `bannerid_day` (`bannerid`,`day`), KEY `zoneid` (`zoneid`) ) ENGINE=ndbcluster DEFAULT CHARSET=latin1; INSERT INTO `t2` VALUES ( 1,0,'2004-09-17', 5,100,100,''), ( 1,0,'2004-09-18', 7,100,100,''), ( 17,0,'2004-09-27',20,132,100,''), ( 4,0,'2004-09-16',23,132,100,''), ( 86,0,'2004-09-18', 7,196,196,''), ( 11,0,'2004-09-16',16,132,100,''), (140,0,'2004-09-18', 0,100,164,''), ( 2,0,'2004-09-17', 7,132,100,''), (846,0,'2004-09-27',11,132,164,''), ( 1,0,'2004-09-18', 8,132,100,''), ( 22,0,'2004-09-27', 9,164,132,''), (711,0,'2004-09-27', 9,100,164,''), ( 11,0,'2004-09-18', 0,196,132,''), ( 41,0,'2004-09-27',15,196,132,''), ( 57,0,'2004-09-18', 2,164,196,''); SELECT DATE_FORMAT(day, '%Y%m%d') as date, DATE_FORMAT(day, '%d-%m-%Y') as date_formatted FROM t2 GROUP BY day ORDER BY day DESC; date date_formatted 20040927 27-09-2004 20040918 18-09-2004 20040917 17-09-2004 20040916 16-09-2004 SELECT DATE_FORMAT(day, '%Y%m%d') as date, DATE_FORMAT(day, '%d-%m-%Y') as date_formatted FROM t2 GROUP BY day ORDER BY day DESC LIMIT 2; date date_formatted 20040927 27-09-2004 20040918 18-09-2004 drop table t2;