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    Topic complex Statistical functions
    Function sum()
    Short Returns the sum of an expression for a database evaluation
    Syntax SUM(numerischer_Ausdruck)
    Parameter numeric_expression: any expression with direct field accesses.
    Return Sum of every calculation of the numeric expression for every record of the evaluation.
    See also:
    max() min() mean() count()
    Description Example:

    VAR sum_income : REAL


    After the execution of the function in sum_income is the sum of all information about income.

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