Identification of data structures
| Użytkownik |
|
| *ID_user PK |
int |
| *Imie |
varchar |
| *Nazwisko |
varchar |
| *Adres_email |
varchar |
| Email |
|
| *ID_email PK |
int |
| 0 message |
varchar |
| *ID_Nadawcy FK |
int |
| *ID_Adresata FK |
int |
| Skrzynka |
|
| *ID_skrzynki PK |
int |
| *ID_user FK |
int |
| 0 ID_email FK |
int |