R: &
X |
Zl |
Z2 |
xl |
zl |
zl’ |
xl |
z2 |
zl’ |
x2 |
zl |
z2’ |
Zl |
Z2 |
Y |
zl |
zl’ |
yi |
zl |
zl’ |
y2 |
zl |
z2’ |
y3 |
z2 |
iT |
y4 |
R !><Ilo S\
X |
Z1 |
Z2 |
K |
X I |
zl |
zl’ |
yl |
XI |
zl |
zl' |
y2 |
x2 |
zl |
z2’ |
y3 |
XI |
z2 |
zl’ |
NLILL |
Bazy danych. Wykład 5 16