CREATE TABLE `Table1` (
  `id` int(8) DEFAULT NULL,
  `content` varchar(10) DEFAULT NULL,
  `total` int(9) DEFAULT '0'
) ENGINE=MyISAM

CREATE TABLE `Table2` (
  `table1_id` int(8) DEFAULT NULL
) ENGINE=MyISAM

INSERT INTO Table1 VALUE (1,'blah',10),(2,'blahblah',44),(3,'blahblahbla',66);
INSERT INTO Table2 VALUE (1),(1),(2),(3),(2),(2),(3),(3);

SELECT 
   a.content,
   a.total,
   b.table1_id, 
   count(*) AS mm,
   a.total+count(*) AS full 
FROM Table2 b 
LEFT JOIN Table1 a ON a.id=b.table1_id 
GROUP BY b.table1_id;

+------------+-------+-----------+----+------+
| content    | total | table1_id | mm | full |
+------------+-------+-----------+----+------+
| blah       |    10 |         1 |  2 |   12 |
| blahblah   |    44 |         2 |  2 |   46 |
| blahblahbl |    66 |         3 |  3 |   69 |
+------------+-------+-----------+----+------+
3 rows in set (0.00 sec)