July 2002
Beginner
424 pages
9h 30m
English
Content preview from SQL: Visual QuickStart Guide
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Determining the Order of Evaluation
Precedence determines the priority of various operators when more than one operator is used in an expression. Operators with higher precedence are evaluated first. Arithmetic operators (+, -, *, and so on) have higher precedence than comparison operators (<, = , >, and so on), which have higher precedence than logical operators (NOT, AND , OR), so this expression:
a or b * c >= d
is equivalent to this one:
a or ((b * c) >= d)
Operators with lower precedence are less binding than those with higher precedence. Table 5.2 lists operator precedences from most to least binding. Operators in the same row have equal precedence.
Associativity determines the order of evaluation in an expression when adjacent operators ...
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