mysqldesc?
mysql desc命令用于查看表結(jié)構(gòu),是DESCRIBE命令的簡寫形式。
mysql desc命令語法:
desc tablename
該命令會顯示表哪些信息呢?具體包括:
字段名稱(Field)
字段類型(Type)
字段是否為null
字段是否為主鍵(key)
字段的默認值(default)
Extra
實例:
mysql> CREATE TABLE employee (
-> ID INT(2) auto_increment primary key,
-> First_name VARCHAR(20),
-> Last_name VARCHAR(30),
-> Start_date DATE,
-> Salary int(6),
-> city VARCHAR(20),
-> description VARCHAR(20)
-> );
Query OK, 0 rows affected (0.02 sec)
mysql>
mysql> desc employee;
+-------------+-------------+------+-----+---------+----------------+
Field | Type | Null | Key | Default | Extra
+-------------+-------------+------+-----+---------+----------------+
ID | int(2) | NO | PRI | NULL | auto_increment
First_name | varchar(20) | YES | | NULL
Last_name | varchar(30) | YES | | NULL
Start_date | date | YES | | NULL
Salary | int(6) | YES | | NULL
city | varchar(20) | YES | | NULL
description | varchar(20) | YES | | NULL
+-------------+-------------+------+-----+---------+----------------+
7 rows in set (0.00 sec)
以上就是對mysql desc 的資料整理