mysql> select * from table1;
+----------+------------+-----+---------------------+
| name_new | transactor | pid | order_date |
+----------+------------+-----+---------------------+
| 1hahha | 1xiaohong | 1 | 2019-08-04 20:45:47 |
| 2hahha | 2xiaohong | 2 | 2019-08-04 20:45:57 |
| 3hahha | 3xiaohong | 3 | 2019-08-04 20:46:02 |
| 4hahha | 4xiaohong | 4 | 2019-08-04 20:46:05 |
| 3hahha | bob | 5 | 2019-08-04 20:46:08 |
| 3hahha | lee | 6 | 2019-08-04 20:46:12 |
| 3hahha | lee | 7 | 2019-08-04 21:56:01 |
| 3hahha | lee | 8 | 2019-08-04 21:56:10 |
| 3hahha | bob | 9 | 2019-08-04 21:56:18 |
| 3hahha | bob | 10 | 2019-08-04 21:56:26 |
+----------+------------+-----+---------------------+
10 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 |
+-------+--------+--------+--------+
| 10 | 10 | 1 | 5.5000 |
+-------+--------+--------+--------+
1 row in set (0.00 sec)
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