By David M. Rothwell
This publication is a practical textual content designed to permit the reader to take advantage of the database INGRES, with the minimal volume of attempt. It presents the fundamental origin for changing into both knowledgeable person of the approach or studying database layout. Combining a pragmatic method with a theoretical knowing, this article permits the reader to develop into trained in INGRES and to appreciate what beneficial properties are getting used and why.
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Extra info for An Introduction to Relational Database Theory
0. You have now learned that (a) the operands of dyadic arithmetic operators in Rel must be of the same type, and (b) the type of the result of an invocation of such an operator is always of the same type as the operands. Tutorial D is silent on such issues, because they are orthogonal to what Tutorial D is really intended for (teaching relational theory). But every implementation of Tutorial D has to address them somehow. Fortunately, arithmetic is orthogonal to relational theory and there is no need for us to be bothered by Rel's behaviour here.
Each tuple maps a pair of values substituted for a and b to the result of their addition, which is substituted for c. The relation is a function because each unique pair maps to exactly one c valueno two tuples with the same a value also have the same b value, so, given an a and a b, so to speak, we know the (only) resulting c. Notice how the relational perception of an operator neutralises the distinction between arguments and result. This relation could also represent the predicate c – b = a, or c – a = b.
The RETURN statement terminates the execution of an invocation and causes the result of evaluating the given expression, A, to be the result of the invocation. x ELSE RETURN B specifies the statement to be executed when the given IF condition is not satisfied. x END IF marks the end of the IF statement. x END OPERATOR marks the end of the program code and in fact the end of the operator definition. Rel additionally supports user-defined operators with program code written in Java™ (the language in which Rel itself is implemented), indicated by the key word FOREIGN.
An Introduction to Relational Database Theory by David M. Rothwell