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mysql 查询数据库表结构

1 mysql> describe tmp_log;
2 +----------+------------------+------+-----+---------+----------------+
3 | Field    | Type             | Null | Key | Default | Extra          |
4 +----------+------------------+------+-----+---------+----------------+
5 | id       | int(20) unsigned | NO   | PRI | NULL    | auto_increment |
6 | url      | varchar(200)     | YES  |     |         |                |
7 | userName | varchar(200)     | YES  |     |         |                |
8 +----------+------------------+------+-----+---------+----------------+
9 3 rows in set (0.01 sec)

 1 mysql> describe tmp_log G;
 2 *************************** 1. row ***************************
 3   Field: id
 4    Type: int(20) unsigned
 5    Null: NO
 6     Key: PRI
 7 Default: NULL
 8   Extra: auto_increment
 9 *************************** 2. row ***************************
10   Field: url
11    Type: varchar(200)
12    Null: YES
13     Key: 
14 Default: 
15   Extra: 
16 *************************** 3. row ***************************
17   Field: userName
18    Type: varchar(200)
19    Null: YES
20     Key: 
21 Default: 
22   Extra: 
23 3 rows in set (0.00 sec)
24 
25 ERROR: 
26 No query specified

1 mysql> desc tmp_log;
2 +----------+------------------+------+-----+---------+----------------+
3 | Field    | Type             | Null | Key | Default | Extra          |
4 +----------+------------------+------+-----+---------+----------------+
5 | id       | int(20) unsigned | NO   | PRI | NULL    | auto_increment |
6 | url      | varchar(200)     | YES  |     |         |                |
7 | userName | varchar(200)     | YES  |     |         |                |
8 +----------+------------------+------+-----+---------+----------------+
9 3 rows in set (0.00 sec)

1 mysql> show  columns from tmp_log;
2 +----------+------------------+------+-----+---------+----------------+
3 | Field    | Type             | Null | Key | Default | Extra          |
4 +----------+------------------+------+-----+---------+----------------+
5 | id       | int(20) unsigned | NO   | PRI | NULL    | auto_increment |
6 | url      | varchar(200)     | YES  |     |         |                |
7 | userName | varchar(200)     | YES  |     |         |                |
8 +----------+------------------+------+-----+---------+----------------+
9 3 rows in set (0.00 sec)

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)

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原文地址：https://www.cnblogs.com/gongxijun/p/5673339.html