mysql generate one million the number of test data (ultra-simple)

 In order to verify mysql query optimization, specifically generated on the one million or tens of millions of pieces of data.

1, construction of the table

-- ----------------------------
DROP TABLE IF EXISTS `user_test`;
CREATE TABLE `user_test` (
id BIGINT(20) UNSIGNED  NOT NULL AUTO_INCREMENT COMMENT '主键id',
`user_name`  VARCHAR(255) DEFAULT NULL  COMMENT '用户名',
`pass_word`  VARCHAR(255) DEFAULT NULL  COMMENT '密码' ,
 A PRIMARY  KEY (ID) 
) 
ENGINE = INNODB 
the AUTO_INCREMENT = . 1 
the COMMENT =  ' user information table ' 
;

2, FIG manually insert a Data:

3, sql insert the data, the data for each run once doubled!

INSERT INTO user_test (user_name, pass_word) 
SELECT
    MD5(RAND()),
    RAND(10000) 
FROM
     user_test

4, a result, one million data inserted just 28 seconds