diff --git a/mysql/modello_er.dia b/mysql/modello_er.dia
new file mode 100644
index 0000000..b051fd4
Binary files /dev/null and b/mysql/modello_er.dia differ
diff --git a/mysql/modello_er.png b/mysql/modello_er.png
new file mode 100644
index 0000000..3b9a025
Binary files /dev/null and b/mysql/modello_er.png differ