Harry Potter is a series of seven fantasy novels written by the British author J. K. Rowling. The series, named after the titular character, chronicles the adventures of a young wizard, Harry Potter, and his friends Ronald Weasley and Hermione Granger, all of whom are students at Hogwarts School of Witchcraft and Wizardry. The main story arc concerns Harry's quest to overcome the Dark wizard Lord Voldemort, who aims to become immortal, conquer the wizarding world, subjugate non-magical people, and destroy all those who stand in his way, especially Harry Potter.
Since the release of the first novel, Harry Potter and the Philosopher's Stone, on 30 June 1997, the books have gained immense popularity, critical acclaim, and commercial success worldwide.[2] The series has also had some share of criticism, including concern for the increasingly dark tone. As of July 2013, the book series had sold between 400 and 450 million copies, making it the best-selling book series in history, and had been translated into 73 languages.[3][4] The last four books consecutively set records as the fastest-selling books in history, with the final instalment selling approximately 11 million copies in the United States within the first twenty-four hours of its release.
A series of many genres, including fantasy, coming of age, and the British school story, (with elements of mystery, thriller, adventure, and romance), it has many cultural meanings and references.[5] According to Rowling, the main theme is death.[6] There are also many other themes in the series, such as prejudice and corruption.[7]
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Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Maecenas porttitor congue massa. Fusce posuere, magna sed pulvinar ultricies, purus lectus malesuada libero, sit amet commodo magna eros quis urna. Nunc viverra imperdiet enim. Fusce est. Vivamus a tellus. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.
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以教员和课程为例介绍一对多关联关系，在这里认为一个教员可以叫多门课程，而一门课程只有1个教员教，这种关系在实际中不太常见，通过教员和课程是多对多的关系。
示例数据：
地址表：
CREATE TABLE ADDRESSES
(
ADDR_ID INT(11) NOT NULL AUTO_INCREMENT,
STREET VAR
In this lesson we used the key "UITextAttributeTextColor" to change the color of the UINavigationBar appearance to white. This prompts a warning "first deprecated in iOS 7.0."
Ins
质数也叫素数，是只能被1和它本身整除的正整数，最小的质数是2，目前发现的最大的质数是p=2^57885161-1【注1】。
判断一个数是质数的最简单的方法如下：
def isPrime1(n):
for i in range(2, n):
if n % i == 0:
return False
return True
但是在上面的方法中有一些冗余的计算，所以
hbase（hadoop）是用java编写的，有些语言（例如python）能够对它提供良好的支持，但也有很多语言使用起来并不是那么方便，比如c#只能通过thrift访问。Rest就能很好的解决这个问题。Hbase的org.apache.hadoop.hbase.rest包提供了rest接口，它内嵌了jetty作为servlet容器。
启动命令：./bin/hbase rest s
下面这段sql本来目的是想更新条件下的数据，可是这段sql却更新了整个表的数据。sql如下：
UPDATE tops_visa.visa_order
SET op_audit_abort_pass_date = now()
FROM
tops_visa.visa_order as t1
INNER JOIN tops_visa.visa_visitor as t2
ON t1.
