mysql 查询数据库表结构

1.

 mysql> describe tmp_log;
 +----------+------------------+------+-----+---------+----------------+
 | Field    | Type             | Null | Key | Default | Extra          |
 +----------+------------------+------+-----+---------+----------------+
 | id       | int(20) unsigned | NO   | PRI | NULL    | auto_increment |
 | url      | varchar(200)     | YES  |     |         |                |
 | userName | varchar(200)     | YES  |     |         |                |
 +----------+------------------+------+-----+---------+----------------+
 3 rows in set (0.01 sec)

2

 mysql> describe tmp_log \G;
 *************************** 1. row ***************************
   Field: id
    Type: int(20) unsigned
    Null: NO
     Key: PRI
 Default: NULL
   Extra: auto_increment
 *************************** 2. row ***************************
   Field: url
    Type: varchar(200)
    Null: YES
     Key:
 Default:
   Extra:
 *************************** 3. row ***************************
   Field: userName
    Type: varchar(200)
    Null: YES
     Key:
 Default:
   Extra:
 3 rows in set (0.00 sec)

 ERROR:
 No query specified

3

 mysql> desc tmp_log;
 +----------+------------------+------+-----+---------+----------------+
 | Field    | Type             | Null | Key | Default | Extra          |
 +----------+------------------+------+-----+---------+----------------+
 | id       | int(20) unsigned | NO   | PRI | NULL    | auto_increment |
 | url      | varchar(200)     | YES  |     |         |                |
 | userName | varchar(200)     | YES  |     |         |                |
 +----------+------------------+------+-----+---------+----------------+
 3 rows in set (0.00 sec)

4

 mysql> show  columns from tmp_log;
 +----------+------------------+------+-----+---------+----------------+
 | Field    | Type             | Null | Key | Default | Extra          |
 +----------+------------------+------+-----+---------+----------------+
 | id       | int(20) unsigned | NO   | PRI | NULL    | auto_increment |
 | url      | varchar(200)     | YES  |     |         |                |
 | userName | varchar(200)     | YES  |     |         |                |
 +----------+------------------+------+-----+---------+----------------+
 3 rows in set (0.00 sec)

5

mysql> show create table tmp_log;
+---------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table   | Create Table                                                                                                                                                                                                                                                     |
+---------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| tmp_log | CREATE TABLE `tmp_log` (
  `id` int(20) unsigned NOT NULL AUTO_INCREMENT,
  `url` varchar(200) DEFAULT '' COMMENT '链接',
  `userName` varchar(200) DEFAULT '' COMMENT '用户名',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8      |
+---------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)