MySQL试图一起使用INNER JOIN和UNION吗？

Question

所以基本上我想做的是在两个表上使用INNER JOIN，但是只选择表A中的特定行和表B中的对应行？

表A被称为“课程”，我想在“ course_title”列下选择名为“微积分”，“英国文学I”和“工作室艺术”的条目，以及它们相应的“ department_id”和I将使用“ department_id”作为参考，使用第二个表（称为“ departments”）创建一个INNER JOIN，该表具有“ department_id”和“ department_name”列。

我想到的唯一方法是使用UNION选择这三门特定的课程，但是我想不通一种方法来使INNER JOIN与之配合使用？ 我尝试了几种不同类型的语法并不断出错，这是我的尝试之一：

(SELECT course.course_title, cours' at line 1
mysql> (SELECT course_title, department_id FROM course WHERE course_title = 'Calculus')
-> UNION
-> (SELECT course_title, department_id FROM course WHERE course_title = 'British Literature I')
-> UNION
-> (SELECT course_title, department_id FROM course WHERE course_title = 'Studio Art I')
-> UNION
-> (SELECT department_name, department_id FROM departments)
-> FROM departments INNER JOIN course ON departments.department_id = course.department_id;

这是我的另一尝试：

(SELECT course.course_title, course.department_id, departments.department_id, departments.department_name WHERE course.course_title = 'Calculus')
-> UNION
-> (SELECT course.course_title, course.department_id, departments.department_id, departments.department_name WHERE course.course_title = 'British Literature I')
-> UNION
-> (SELECT course.course_title, course.department_id, departments.department_id, departments.department_name WHERE course.course_title = 'Studio Art I')
-> FROM departments INNER JOIN course ON departments.department_id = course.department_id;

关于这是否行得通的任何想法？ 如果是这样，如何纠正我的语法？ 如果没有，还有什么方法？

谢谢！！

Answer 1

您应该使用IN子句...

像这样

WHERE course IN ('Calculus','Physics','Art')

Answer 2

您可以像下面这样编写查询。

SELECT course.course_title, course.department_id, departments.department_id, departments.department_name 
FROM departments 
  INNER JOIN course ON departments.department_id = course.department_id
WHERE course.course_title IN ('Calculus', 'British Literature I','Studio Art I')