Question

so I have three tables with content and one that holds row order of those three tables

here are the tables

table content_order
id | content_type | content id
1 | content1 | 1
2 | content1 | 2
3 | content3 | 1
4 | content2 | 1

table content1
id | some_text
1 | aaaa
2 | bbb

table content2
id | some_text
1 | text yyyy

table content3
id | some_text
1 | text bbbb

so how do I get this?

content_type | some_text | content_id
content1 | aaaa | 1 | 
content2 | bbb | 2 | 
content3 | yyyy | 1 | 
content2 | bbbb | 1 | 

Answer 1

Try this:

SELECT content_type, some_text, id as content_id
FROM (
               SELECT 'content1' as content_type, content1.Id, content1.some_text
     UNION ALL SELECT 'content2', content2.Id, content2.some_text
     UNION ALL SELECT 'content3', content3.Id, content3.some_text) contents
JOIN content_order
  ON content_order.content_type = contents.content_type
 AND content_order.content_Id = contents.Id
ORDER BY content_order.id