Operator Scope of Action:
Operator First Added:
Counts the number of notes in the list derived from group that satisfy the expression condition.
condition is action code forming a valid conditional query test, i.e. it equates to true when matched. Some query-style operators terms may allow use of regular expressions.
This equivalent to use of sum_if(), as the next two code examples have the same result:
but this is perhaps more easily understood as: