MySQL - Relación de campo texto a campo entero

Create table contrato (

	idcontrato Int NOT NULL,

	idinmueble Int NOT NULL,

	idarrendatario Int NOT NULL,

	inicioControto Date,

	duracionContrato Int,

	rentaMensual Decimal(7,2),

 Primary Key (idcontrato),

 Constraint R01 Foreign Key (idarrendatario) references arrendatario (idarrendatario) on delete  restrict on update cascade,

 Constraint R02 Foreign Key (idinmueble) references inmueble (idinmueble) on delete  restrict on update cascade

) ENGINE = MyISAM;