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customer-name Adams Hayes Figure 316 Result of customer -name ( borrower loan-number = loanloan-number ( branch-name = Perryridge (borrower loan))) this Given a relational-algebra expression E, the expression x (E) returns the result of expression E under the name x A relation r by itself is considered a (trivial) relational-algebra expression Thus, we can also apply the rename operation to a relation r to get the same relation under a new name A second form of the rename operation is as follows Assume that a relationalalgebra expression E has arity n Then, the expression x(A1 ,A2 ,,An ) (E) returns the result of expression E under the name x, and with the attributes renamed to A1 , A2 , , An To illustrate renaming a relation, we consider the query Find the largest account balance in the bank Our strategy is to (1) compute rst a temporary relation consisting of those balances that are not the largest and (2) take the set difference between the relation balance (account) and the temporary relation just computed, to obtain the result Step 1: To compute the temporary relation, we need to compare the values of all account balances We do this comparison by computing the Cartesian product account account and forming a selection to compare the value of any two balances appearing in one tuple First, we need to devise a mechanism to distinguish between the two balance attributes We shall use the rename operation to rename one reference to the account relation; thus we can reference the relation twice without ambiguity java ean 128 Generating a GS1 - 128 (formerly EAN - 128 ) barcode using ZXing ...
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Java EAN-128 /GS1-128 Generator is a mature and time-tested barcode generating library for Java developers. It will help users generate EAN-128/GS1- 128 ... balance 500 400 700 750 350 Figure 317 Result of the subexpression accountbalance ( accountbalance < dbalance (account d (account))) reach the desired ending point, then drag the red scissors slider all the way to the left until it won t move further The McGraw Hill Companies, 2001 java barcode ean 128 Welcome to Barcode4J
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