17.leetCode620:Not Boring Movies

题目：
X city opened a new cinema, many people would like to go to this cinema. The cinema also gives out a poster indicating the movies’ ratings and descriptions.
Please write a SQL query to output movies with an odd numbered ID and a description that is not ‘boring’. Order the result by rating.

For example, table cinema:
+———+———–+————–+———–+
| id | movie | description | rating |
+———+———–+————–+———–+
| 1 | War | great 3D | 8.9 |
| 2 | Science | fiction | 8.5 |
| 3 | irish | boring | 6.2 |
| 4 | Ice song | Fantacy | 8.6 |
| 5 | House card| Interesting| 9.1 |
+———+———–+————–+———–+
For the example above, the output should be:
+———+———–+————–+———–+
| id | movie | description | rating |
+———+———–+————–+———–+
| 5 | House card| Interesting| 9.1 |
| 1 | War | great 3D | 8.9 |
+———+———–+————–+———–+

题意：查询cinema表中id为奇数且description不为boring的电影，并将结果按rating从大到小进行排序。

代码：

select * from cinema
where mod(id,2)=1 and description != 'boring'
order by rating desc

判断一个数是否为奇数的方法：
1.mod(id,2)=1
2.id%2<>1 或 id%2！=0

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