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)