MySQL错误输出不确定查询有什么错误

Question

尝试编写并执行MySQL查询，以显示所有成本低于50美元的动作或喜剧电影的电影编号、电影标题、电影成本和电影类型。按流派按升序对结果进行排序。

mysql> select mv_no, mv_name, mv_cost, mv_genre from movie    
    -> where mv_genre = ('Action' or 'Comedy') and mv_cost < 50    
    -> order by mv_genre;

+-------+----------------------------+---------+----------+
| mv_no | mv_name                    | mv_cost | mv_genre |    
+-------+----------------------------+---------+----------+    
| 1245  | Time to Burn               | 45.49   | ACTION   |    
| 1237  | Beatnik Fever              | 29.95   | COMEDY   |    
| 1239  | Where Hope Dies            | 25.49   | DRAMA    |    
| 1234  | The Cesar Family Christmas | 39.95   | FAMILY   |    
+-------+----------------------------+---------+----------+
4 rows in set, 10 warnings (0.00 sec)

Answer 1

更改为：

select mv_no, mv_name, mv_cost, mv_genre from movie

where (mv_genre = 'Action' or mv_genre = 'Comedy') and mv_cost < 50

order by mv_genre;