5. owner names and land at time t = 5
R0
=
select
t = 5 on
Landownership
R0
name
t
landID
kim
t>3,t<=5,t=5
B
sara
t>3,t<=6,t=5
D
john
t>4,t<=7,t=5
C
pete
t>3,t<=7,t=5
A
kim
t>4,t<=6,t=5
E
R1
=
project
R0
on names, landID
R1
name
landID
kim
B
sara
D
john
C
pete
A
kim
E