MySQL GROUP BY WITH ROLLUP

类似Oracle中的rollup，不同的是不能排序，select后面查询的字段可以不是group by的字段。

SELECT a.actor_id,COUNT(1) cc FROM film_actor a,actor b 

WHERE a.actor_id=b.actor_id 
AND  a.actor_id<10
GROUP BY actor_id WITH ROLLUP;
+----------+-----+
| actor_id | cc  |
+----------+-----+
|        1 |  19 |
|        2 |  25 |
|        3 |  22 |
|        4 |  22 |
|        5 |  29 |
|        6 |  20 |
|        7 |  30 |
|        8 |  20 |
|        9 |  25 |
|     NULL | 212 |
+----------+-----+


SELECT a.actor_id,first_name,COUNT(1) cc FROM film_actor a,actor b 
WHERE a.actor_id=b.actor_id 
AND  a.actor_id<10
GROUP BY actor_id WITH ROLLUP;
+----------+------------+-----+
| actor_id | first_name | cc  |
+----------+------------+-----+
|        1 | PENELOPE   |  19 |
|        2 | NICK       |  25 |
|        3 | ED         |  22 |
|        4 | JENNIFER   |  22 |
|        5 | JOHNNY     |  29 |
|        6 | BETTE      |  20 |
|        7 | GRACE      |  30 |
|        8 | MATTHEW    |  20 |
|        9 | JOE        |  25 |
|     NULL | JOE        | 212 |
+----------+------------+-----+


SELECT * FROM (
SELECT a.actor_id,COUNT(1) cc FROM film_actor a,actor b 
WHERE a.actor_id=b.actor_id 
AND  a.actor_id<10
GROUP BY actor_id WITH ROLLUP) bb
ORDER BY cc;
+----------+-----+
| actor_id | cc  |
+----------+-----+
|        1 |  19 |
|        6 |  20 |
|        8 |  20 |
|        3 |  22 |
|        4 |  22 |
|        2 |  25 |
|        9 |  25 |
|        5 |  29 |
|        7 |  30 |
|     NULL | 212 |
+----------+-----+