mysql中insert into select语句测试
发布:smiling 来源: PHP粉丝网 添加日期:2014-09-23 17:22:25 浏览: 评论:0
mysql中insert into select语句是把指定表数据复制到我们新表中去,这个就是在insert into 的基础加了一个select功能了,下面来看一些测试的例子.
mysql迅速制造大批数据,复制一个表中的(部分或全部)数据到另一个表中.
用法:INSERT INTO table_name1 (field1,field2) SELECT field1,field2 FROM table_name2;
前提条件,代码如下:
- MySQL
- CREATE TABLE `user` (
- `id` int(10) NOT NULL AUTO_INCREMENT,
- `username` varchar(30) NOT NULL,
- `password` char(32) NOT NULL,
- PRIMARY KEY (`id`)
- ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
- CREATE TABLE `user_his` (
- `his_id` int(10) NOT NULL AUTO_INCREMENT,
- `id` int(10) NOT NULL,
- `username` varchar(30) NOT NULL,
- `password` char(32) NOT NULL,
- PRIMARY KEY (`his_id`)
- ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
查看一下结构,更直观,代码如下:
- mysql> desc user;
- +----------+-------------+------+-----+---------+----------------+
- | Field | Type | Null | Key | Default | Extra |
- +----------+-------------+------+-----+---------+----------------+
- | id | int(10) | NO | PRI | NULL | auto_increment |
- | username | varchar(30) | NO | | NULL | |
- | password | char(32) | NO | | NULL | |
- +----------+-------------+------+-----+---------+----------------+
- 3 rows in set (0.00 sec)
- mysql> desc user_his;
- +----------+-------------+------+-----+---------+----------------+
- | Field | Type | Null | Key | Default | Extra |
- +----------+-------------+------+-----+---------+----------------+
- | his_id | int(10) | NO | PRI | NULL | auto_increment |
- | id | int(10) | NO | | NULL | |
- | username | varchar(30) | NO | | NULL | |
- | password | char(32) | NO | | NULL | |
- +----------+-------------+------+-----+---------+----------------+
- 4 rows in set (0.01 sec)
插入原始数据,MySQL
- mysql> INSERT INTO `user`(`username`,`password`) VALUES ('hello','123456'),('twitter','123456'),('baidu','123456'),('google','123456'),('facebook','123456'),('linux','123456'),('cisco','123456'),('huawei','123456'),('lenovo','123456'),('apple','123456'),('oracle','123456'),('sun','123456');
复制数据到历史表,MySQL
mysql> INSERT INTO `user_his`(`id`,`username`,`password`) select `id`,`username`,`password` from `user`;//phpfensi.com
附加mysql大批量复制数据,时间变化:在自己的电脑上测试(Ubuntu14.04 LTS 64位 + xampp),前3000条数据速度比较快,3000条以后执行时间成倍增加,2万5千条数据执行时间1分钟,314万数据,两分29秒,代码如下:
- mysql> insert into user(username,password) select username,password from user;
- Query OK, 12 rows affected, 1 warning (0.07 sec)
- Records: 12 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;
- Query OK, 24 rows affected, 1 warning (0.08 sec)
- Records: 24 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;
- Query OK, 48 rows affected, 1 warning (0.11 sec)
- Records: 48 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;
- Query OK, 96 rows affected, 1 warning (0.10 sec)
- Records: 96 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;
- Query OK, 192 rows affected, 1 warning (0.10 sec)
- Records: 192 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;
- Query OK, 384 rows affected, 1 warning (0.10 sec)
- Records: 384 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;\
- Query OK, 768 rows affected, 1 warning (0.13 sec)
- Records: 768 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;\
- Query OK, 1536 rows affected, 1 warning (0.15 sec)
- Records: 1536 Duplicates: 0 Warnings: 1
- mysql>
- mysql> insert into user(username,password) select username,password from user;\
- Query OK, 3072 rows affected, 1 warning (0.17 sec)
- Records: 3072 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;\
- Query OK, 6144 rows affected, 1 warning (0.28 sec)
- Records: 6144 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;\
- Query OK, 12288 rows affected, 1 warning (0.42 sec)
- Records: 12288 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;\
- Query OK, 24576 rows affected, 1 warning (0.99 sec)
- Records: 24576 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;\
- Query OK, 49152 rows affected, 1 warning (1.98 sec)
- Records: 49152 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;\
- Query OK, 98304 rows affected, 1 warning (4.04 sec)
- Records: 98304 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;\
- Query OK, 196608 rows affected, 1 warning (8.89 sec)
- Records: 196608 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;\
- Query OK, 393216 rows affected, 1 warning (17.14 sec)
- Records: 393216 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;\
- Query OK, 786432 rows affected, 1 warning (38.07 sec)
- Records: 786432 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;\
- Query OK, 1572864 rows affected, 1 warning (1 min 11.91 sec)
- Records: 1572864 Duplicates: 0 Warnings: 1
- mysql> insert into user(username,password) select username,password from user;\//开源代码phpfensi.com
- Query OK, 3145728 rows affected, 1 warning (2 min 29.04 sec)
- Records: 3145728 Duplicates: 0 Warnings: 1
Tags: mysql语句测试 insert 语句测试
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