more efficient sql stmt

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13947 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_commands/mod_commands.c

@@ -2823,7 +2823,8 @@ SWITCH_STANDARD_API(show_function)
 		    }
 		}
 	} else if (!strcasecmp(command, "distinct_channels")) {
-		sprintf(sql, "select * from channels left join calls on channels.uuid=calls.caller_uuid where uuid in (select caller_uuid from calls) or (uuid not in (select caller_uuid from calls) and uuid not in (select callee_uuid from calls)) order by created_epoch");
+		sprintf(sql, "select * from channels left join calls on "
+				"channels.uuid=calls.caller_uuid where channels.uuid not in (select callee_uuid from calls) order by created_epoch");
 		if (argv[2] && !strcasecmp(argv[1], "as")) {
 			as = argv[2];
 		}