我使用以下脚本在mysql中创建一个表:CREATETABLEIFNOTEXISTSusers_x_activities(idintNOTNULLauto_increment,id_userintunsignedNOTNULL,id_attivitaintunsignedNOTNULL,PRIMARYKEY(id),FOREIGNKEY(id_user)REFERENCESutente(id),FOREIGNKEY(id_attivita)REFERENCESattivita(id))ENGINE=INNODB;当我从phpMyAdmin导出创建的表时，我得到以下脚本CREATETAB

我使用以下脚本在mysql中创建一个表:CREATETABLEIFNOTEXISTSusers_x_activities(idintNOTNULLauto_increment,id_userintunsignedNOTNULL,id_attivitaintunsignedNOTNULL,PRIMARYKEY(id),FOREIGNKEY(id_user)REFERENCESutente(id),FOREIGNKEY(id_attivita)REFERENCESattivita(id))ENGINE=INNODB;当我从phpMyAdmin导出创建的表时，我得到以下脚本CREATETAB