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The precision (p) and scale (s) of a DECIMAL result depend
on the operation used to derive it. The following rules define the
precision and scale that result from arithmetic operations on two
decimal values having precisions p1 and p2 and
respective scales s1 and s2.
Rules are also provided for the resulting precision and scale of
aggregate functions that operate on a single expression having a
precision of p1 and a scale of s1.
Arithmetic operations and aggregate functions are discussed further
in Chapter 8 "Expressions"
Addition and Subtraction
p = MIN(27, MAX (p1 - s1, p2 - s2)
+ MAX(s1, s2)+ 1)
s = MAX (s1,s2)
Multiplication
p = MIN (27, p1 + p2)
s = MIN (27, s1 + s2)
Division
p = 27
s = 27 - MIN (27, p1 - s1 + s2)
where p1 and s1 describe the numerator operand, and
p2 and s2 describe the denominator operand.
MAX and MIN Functions
p = p1
s = s1
SUM Function
p = 27
s = s1
AVG Function
p = 27
s = 27 - p1 + s1
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