Compute the average of a single-column Query, or None
if the Query is empty
Count the number of Some
elements of a single-column Query.
Compute the maximum value of a single-column Query, or None
if the Query is empty
Compute the minimum value of a single-column Query, or None
if the Query is empty
Compute the sum of a single-column Query, or None
if the Query is empty
Extension methods for Queries of a single column