mysql 组合聚集函数

mysql> select * from table1;
+----------+------------+-----+---------------------+
| name_new | transactor | pid | order_date          |
+----------+------------+-----+---------------------+
| 1hahha   | 1xiaohong  |    | -- :: |
| 2hahha   | 2xiaohong  |    | -- :: |
| 3hahha   | 3xiaohong  |    | -- :: |
| 4hahha   | 4xiaohong  |    | -- :: |
| 3hahha   | bob        |    | -- :: |
| 3hahha   | lee        |    | -- :: |
| 3hahha   | lee        |    | -- :: |
| 3hahha   | lee        |    | -- :: |
| 3hahha   | bob        |    | -- :: |
| 3hahha   | bob        |   | -- :: |
+----------+------------+-----+---------------------+
 rows in set (0.00 sec)

mysql> select count(*) as count,max(pid) as maxpid,min(pid) as minpid,avg(pid) as avgpid from table1;
+-------+--------+--------+--------+
| count | maxpid | minpid | avgpid |
+-------+--------+--------+--------+
|     |      |       | 5.5000 |
+-------+--------+--------+--------+
 row in set (0.00 sec)