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Rn is called the body of the rule. 1 The tax accountant from Chapter 1 may use the following query Q tax to find the Social Security number and taxes due for each person: Tax Due(s, t) :— Taxrecord(s, w, i, c), Taxtable(inc, t), w + i + c = inc. 1 Syntax 41 Here Taxrecord, Taxable ∈ I are input database relations and Tax Due ∈ D is the only defined relation. 2 Suppose that relation Street (n, x, y) contains all combinations of street name n and locations (x, y) such that a location belongs to the street.

The weight of each package can be represented in the following relational database table. Package Serial No. 5 To all destinations within the United States, the postage fee charged for packages can be computed based on the weight of the package and the postage rate associated with the weight. The following Postage relation is a logical-level view of this relation. Postage Weight Fee 5 .. 65 .. 2 SQL 37 Suppose Mr. Johnson would like to know how much he should pay to send the three packages. Weight The following is a more complex example of aggregation constraints.

Suppose further that those who can apply to the computer science master’s program must be either computer science majors or eligible for a computer science minor, among other requirements. Note that if x are the students eligible for a computer science minor, then y, the students who can apply, is expressible as y ≤ B c ∨ x. This constraint can be rewritten as x ′ ∧ y ≤ B c. Hence this information can be expressed by the rule: Can Apply C S M S(y) :— CS Minor (x), x ′ ∧ y ≤ B c. The two preceding constraint tuples form an input database, and the rule is a Datalog program.

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