create table t_base_user(
oid bigint(20) not null primary key auto_increment comment "",
created_at datetime null comment ''
)engine=innodb

mysql> show table status like "t_base_user" \G;
*************************** 1. row ***************************
    Name: t_base_user
   Engine: InnoDB
   Version: 10
 Row_format: Dynamic
    Rows: 0
Avg_row_length: 0
 Data_length: 16384
Max_data_length: 0
Index_length: 0
  Data_free: 0
Auto_increment: 1
 Create_time: 2017-12-17 20:10:24
 Update_time: NULL
 Check_time: NULL
  Collation: utf8_unicode_ci
  Checksum: NULL
Create_options: 
   Comment: 
1 row in set (0.01 sec)

mysql> show create table t_base_user\G;
*************************** 1. row ***************************
  Table: t_base_user
Create Table: CREATE TABLE `t_base_user` (
`oid` bigint(20) NOT NULL AUTO_INCREMENT,
`created_at` datetime DEFAULT NULL,
PRIMARY KEY (`oid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci
1 row in set (0.00 sec)

mysql> show storage engines;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine       | Support | Comment                            | Transactions | XA  | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| MRG_MYISAM     | YES   | Collection of identical MyISAM tables             | NO      | NO  | NO     |
| CSV        | YES   | CSV storage engine                       | NO      | NO  | NO     |
| MyISAM       | YES   | MyISAM storage engine                     | NO      | NO  | NO     |
| BLACKHOLE     | YES   | /dev/null storage engine (anything you write to it disappears) | NO      | NO  | NO     |
| MEMORY       | YES   | Hash based, stored in memory, useful for temporary tables   | NO      | NO  | NO     |
| InnoDB       | DEFAULT | Supports transactions, row-level locking, and foreign keys   | YES     | YES | YES    |
| ARCHIVE      | YES   | Archive storage engine                     | NO      | NO  | NO     |
| PERFORMANCE_SCHEMA | YES  | Performance Schema                       | NO      | NO  | NO     |
| FEDERATED     | NO   | Federated MySQL storage engine                 | NULL     | NULL | NULL    |
+--------------------+---------+---------------------------------------------------------------+--------------+------+------------+
9 rows in set (0.00 sec)