1. Selection
Data Model
Query
Prism
x,y,z
x<y, y<5, y<z,z<10,x>0,y>0,z>0
R0 =
select
z = 5 from
Prism
x,y,z
x<y, y<5, y<z,z<10,x>0,y>0,z>0, z = 5
