mysql查询表字所有字段的方法：使用“SHOW FROM”语句配合FULL关键字来查询，语法“SHOW FULL COLUMNS FROM table_name”，可以显示指定数据表的所有字段信息。
mysql查询表字所有字段
1、查看所有表名：
show tables [from db_name];
2、查看字段信息
SHOW FULL COLUMNS FROM table_name
获取以下信息
Field ：字段名
Type：字段类型
Collation：字符集（mysql 5.0以上有）
Null ：是否可以为NULL
Key：索引（PRI,unique,index)
Default：缺省值
Extra：额外（是否 auto_increment)
Privileges：权限
Comment：备注（mysql 5.0以上有)
mysql> create table teacher # 创建teacher表
-> (
-> Id int (5) auto_increment not null primary key,
-> name char(10) not null,
-> address varchar(50) default 'No.1 Mid school',
-> year date
-> );
Query OK, 0 rows affected (0.02 sec)
mysql> show tables;
+------------------+
| Tables_in_school |
+------------------+
| teacher |
+------------------+
1 row in set (0.00 sec)
mysql> show full columns from teacher; # 显示teacher表的所有字段
+---------+-------------+-------------------+------+-----+-----------------+----------------+---------------------------------+---------+
| Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment |
+---------+-------------+-------------------+------+-----+-----------------+----------------+---------------------------------+---------+
| Id | int(5) | NULL | NO | PRI | NULL | auto_increment | select,insert,update,references | |
| name | char(10) | latin1_swedish_ci | NO | | NULL | | select,insert,update,references | |
| address | varchar(50) | latin1_swedish_ci | YES | | No.1 Mid school | | select,insert,update,references | |
| year | date | NULL | YES | | NULL | | select,insert,update,references | |
+---------+-------------+-------------------+------+-----+-----------------+----------------+---------------------------------+---------+
4 rows in set (0.01 sec)
mysql> drop table teacher; # 删除teacher表
Query OK, 0 rows affected (0.03 sec)
mysql> show tables;
Empty set (0.00 sec)
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