How to modify the mysql database table structure

Methods to modify the table structure of mysql database: 1. View the table structure; 2. Add columns; 3. Delete columns, the code is [mysql> alter table student drop column birthday]; 4. Modify columns, the code is 【mysql> alter table】.

The operating environment of this tutorial: windows7 system, mysql version 8.0.22, thinkpad t480 computer.

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##Modify Mysql database table structure method:

1. View table structure

mysql> show create table student;
+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table   | Create Table                                                                                                                                                                                          |
+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| student | CREATE TABLE `student` (
  `ID` int(11) NOT NULL AUTO_INCREMENT,
  `NAME` varchar(20) NOT NULL,
  `AGE` int(11) NOT NULL,
  PRIMARY KEY (`ID`)
) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8 |
+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.09 sec)

2. Add columns

mysql> alter table student add column birthday datetime;
Query OK, 0 rows affected (2.06 sec)
Records: 0  Duplicates: 0  Warnings: 0

3. Delete columns

mysql> alter table student drop column birthday;
Query OK, 0 rows affected (0.80 sec)
Records: 0  Duplicates: 0  Warnings: 0

4. Modify the column

--1.修改列的类型
mysql> alter table student modify age int not null;
Query OK, 0 rows affected (0.09 sec)
Records: 0  Duplicates: 0  Warnings: 0
 
--2.修改列的名称
mysql> alter table student change column name sname varchar(20);
Query OK, 0 rows affected (1.31 sec)
Records: 0  Duplicates: 0  Warnings: 0

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