MySQL試圖一起使用INNER JOIN和UNION嗎？

Question

所以基本上我想做的是在兩個表上使用INNER JOIN，但是只選擇表A中的特定行和表B中的對應行？

表A被稱為“課程”，我想在“ course_title”列下選擇名為“微積分”，“英國文學I”和“工作室藝術”的條目，以及它們相應的“ department_id”和I將使用“ department_id”作為參考，使用第二個表（稱為“ departments”）創建一個INNER JOIN，該表具有“ department_id”和“ department_name”列。

我想到的唯一方法是使用UNION選擇這三門特定的課程，但是我想不通一種方法來使INNER JOIN與之配合使用？ 我嘗試了幾種不同類型的語法並不斷出錯，這是我的嘗試之一：

(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;

這是我的另一嘗試：

(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;

關於這是否行得通的任何想法？ 如果是這樣，如何糾正我的語法？ 如果沒有，還有什么方法？

謝謝！！

Answer 1

您應該使用IN子句...

像這樣

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

Answer 2

您可以像下面這樣編寫查詢。

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')