一个表数据作为另一表列中的列标题
[英]One Table Data as Column Headings in Another table Columns
问题描述
Two Table 1.ClassSubjectTable and 2.SubjectTable 
两张表1.ClassSubjectTable和2.SubjectTable
ClassSubjectTable 类主题表
------------------------------------
class_subject_id |subject1 |subject2
------------------------------------
1 (General Id) | 1 | 2 -----> are subject_id's
SubjectTable 主题表
-------------------------
subject_id | subject_name
-------------------------
1 | Maths
2 | Science
I want to get 我想得到
------------------------------------
class_subject_id |subject1 |subject2
------------------------------------
1 |Maths | Science
More over there is no relation between them. 而且，它们之间没有关系。 Is it Possible? 可能吗？ How? 怎么样？
1 个解决方案
解决方案1
1 已采纳 2016-01-25 11:23:35
Simple JOIN : 简单的JOIN ：
SELECT c.class_subject_id, s1.subject_name AS subject1, s2.subject_name AS subject2
FROM ClassSubjectTable c
LEFT JOIN SubjectTable s1
ON c.subject1 = s1.subject_id
LEFT JOIN SubjectTable s2
ON c.subject2 = s2.subject_id;
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