'domain(도메인)함수

DLookup() (Returns the value In the specified field)
DMin(), DMax() (Returns the minimum or maximum value In the specified field)
DFirst(), DLast() (Returns the value In the specified field From the first or last physical record)
DAvg() (Returns the arithmetical average of the values In the specified field)
DSum() (Returns the sum of the values In the specified field)
DStDev(), DStDevP() (Returns the standard deviation or population standard deviation For
                          the specified field)
DVar(), DVarP() (Returns the variance or population variance For the specified field)
DCount() (Returns the number of records With non-Null values In the specified field)

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