mysql如何查询表字所有字段？

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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