Resultat d'une jointure sous php/mysql

bjr, puis je avoir plus d'explications???

voici la structure des 3 tables concernees: contact, sector et contsec(ki lie les 2 tables precedentes)

CREATE TABLE `contact` (
`idcont` varchar(14) NOT NULL,
`orgId` varchar(14) default NULL,
`officeId` varchar(14) default NULL,
`salutation` varchar(10) default NULL,
`firstName` varchar(50) NOT NULL default '',
`lastName` varchar(50) NOT NULL default '',
`title` varchar(50) default NULL,
`phone1` varchar(100) default NULL,
`phone2` varchar(100) default NULL,
PRIMARY KEY (`idcont`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

CREATE TABLE `sector` (
`idsec` varchar(14) NOT NULL,
`name` varchar(55) NOT NULL default '',
PRIMARY KEY (`idsec`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;


CREATE TABLE `contsec` (
`idcont` varchar(14) NOT NULL,
`idsec` varchar(14) NOT NULL,
PRIMARY KEY (`idcont`,`idsec`),
KEY `abfkindex1` (`idcont`),
KEY `abfkindex2` (`idsec`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;