DECIMAL returns the decimal value of x, with a precision
specified by p and q. The result has the mode
and scale of x.
 >>-DECIMAL(x-+-----------+-)-----------------------------------><
'-,p-+----+-'
'-,q-'
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Abbreviation: DEC
- x
- Reference.
- p
- Restricted expression specifying the number of digits to be
maintained throughout the operation.
- q
- Restricted expression specifying the scaling factor of the
result. For a fixed-point result, if p is given and q is
omitted, a scaling factor of zero is assumed. For a floating-point
result, q must be omitted.
If both p and q are omitted, the precision
of the result is determined from the rules for base conversion.
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