+=head1 CLASS METHODS
+
+=over 4
+
+=item churn_sql START, END
+
+Returns an SQL statement for the customer churn status query. The columns
+returned are the custnum and the number of active, suspended, and cancelled
+packages (excluding one-time packages) at the start date ("s_active",
+"s_suspended", and "s_cancelled") and the end date ("e_active", etc.).
+
+=cut
+
+# not sure this belongs here...FS::cust_main::Packages?
+
+sub churn_sql {
+ my $self = shift;
+ my ($speriod, $eperiod) = @_;
+
+ my $s_sql = FS::h_cust_pkg->status_as_of_sql($speriod);
+ my $e_sql = FS::h_cust_pkg->status_as_of_sql($eperiod);
+
+ my @select = (
+ 'custnum',
+ 'COALESCE(SUM(s.is_active::int),0) as s_active',
+ 'COALESCE(SUM(s.is_suspended::int),0) as s_suspended',
+ 'COALESCE(SUM(s.is_cancelled::int),0) as s_cancelled',
+ 'COALESCE(SUM(e.is_active::int),0) as e_active',
+ 'COALESCE(SUM(e.is_suspended::int),0) as e_suspended',
+ 'COALESCE(SUM(e.is_cancelled::int),0) as e_cancelled',
+ );
+ my $from = "($s_sql) AS s FULL JOIN ($e_sql) AS e USING (custnum)";
+
+ return "SELECT ".join(',', @select)." FROM $from GROUP BY custnum";
+}
+