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Risk

high

low

Risk Risk

high low

Risk Risk

high

degree

yes no

city age

city country

age

50in[25,45]income income

high low high low

(a) (b)

=30

50in[25,45]income income

high low high lowdeg.

deg. deg.deg. deg.

Risk

high

&city

yes no

age

=30

Risk

high

Risk

high

& &city country

yes no

Risk

high

&city

(c)

age

(populate)

Relations

Intensional

Dimensions

Extensional

Dimensions

Relational

ExtendedRelationalAlgebra

Dimension

Algebra

Algebra

(lookup)

(mine

)

(regionize)

(refresh)

23

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