mysql - 如何在 PHP 中从单个表连接 Mysql 中的多个条件的多个查询？

Question

我在 MySQL 中有一个表

------------------------------
| ID | Subject | Marks | Term |
-------------------------------
| 1  | English | 45    | 1    |
| 2  | Hindi   | 34    | 1    |
| 3  | English | 54    | 2    |
| 4  | Hindi   | 33    | 2    |
------------------------------

我想要的输出如下:

--------------------------------------
| Subject | Marks_Term1 | Marks_Term2 |
--------------------------------------
| English |  45         | 54          |
|  Hindi  |  34         | 33          |
--------------------------------------

请帮助我编写代码，我们将不胜感激。

SELECT marks_entry.subject_id, marks_entry.main_exam, marks_entry.main_exam
FROM marks_entry 
WHERE marks_entry.term_id = 1 
 LEFT JOIN SELECT marks_entry.subject_id, marks_entry.main_exam, marks_entry.main_exam FROM marks_entry WHERE marks_entry.term_id = 2

Answer 1

试试这个，

SELECT A.Subject, A.Marks AS Marks_Term1, B.Marks AS Marks_Term2
FROM {tableName} A, {tableName} B
WHERE A.Subject = B.Subject