MySQL INSERT命令

Posted 2020-10-22 YY&BB姐姐的光阴故事

　mysql允许将一个或多个元组插入已存在的table中。

　格式：INSERT INTO  表名 (属性名1,属性名2,属性名3) VALUES (value1,value2,value3);

               INSERT INTO  表名 (属性名1,属性名2,属性名3) VALUES (value-a1,value-a2,value-a3),(value-b1,value-b2,value-b3);

　说明：若value数值是字符型，则需要加上双引号""

 

　1.逐个元组插入

　1）首先创建一个TABLE

mysql> use test
Database changed
mysql> create table courses
    -> (num int AUTO_INCREMENT PRIMARY KEY,
    -> name char(20) NOT NULL,
    -> submission_date char(10)
    -> )ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.07 sec)

　2）然后插入元组

mysql> insert into courses (name,submission_date) values("数学",NOW());
Query OK, 1 row affected, 1 warning (0.01 sec)

mysql> insert into courses (name,submission_date) values("语文",NOW());
Query OK, 1 row affected, 1 warning (0.03 sec)

mysql> insert into courses (name,submission_date) values("英语",NOW());
Query OK, 1 row affected, 1 warning (0.06 sec)

mysql> insert into courses (name,submission_date) values("化学",NOW());
Query OK, 1 row affected, 1 warning (0.03 sec)

mysql> insert into courses (name,submission_date) values("历史",NOW());
Query OK, 1 row affected, 1 warning (0.01 sec)

　　其中，属性num的值没有设置，因为它的值是自动递增的。

　　3）元组查看

mysql> select * from courses;
+-----+--------+-----------------+
| num | name   | submission_date |
+-----+--------+-----------------+
|   1 | 数学 | 2018-01-30      |
|   2 | 语文 | 2018-01-30      |
|   3 | 英语 | 2018-01-30      |
|   4 | 化学 | 2018-01-30      |
|   5 | 历史 | 2018-01-30      |
+-----+--------+-----------------+
5 rows in set (0.00 sec)

　2.多个元组插入

mysql> insert into courses (name,submission_date) values("生物",NOW()),
    -> ("政治",NOW()),("体育",NOW());
Query OK, 3 rows affected, 3 warnings (0.03 sec)
Records: 3  Duplicates: 0  Warnings: 3

mysql> select * from courses;
+-----+--------+-----------------+
| num | name   | submission_date |
+-----+--------+-----------------+
|   1 | 数学 | 2018-01-30      |
|   2 | 语文 | 2018-01-30      |
|   3 | 英语 | 2018-01-30      |
|   4 | 化学 | 2018-01-30      |
|   5 | 历史 | 2018-01-30      |
|   6 | 生物 | 2018-01-30      |
|   7 | 政治 | 2018-01-30      |
|   8 | 体育 | 2018-01-30      |
+-----+--------+-----------------+
8 rows in set (0.00 sec)