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MySQL / PHP joining single record to multiple records

开发者 https://www.devze.com 2023-03-30 22:23 出处:网络
I have a table called ABC with 3 fields : id1, id2, id3 with data : id1 | id2 | id3 ________________ 1|5| 3

I have a table called ABC with 3 fields : id1, id2, id3 with data :

id1 | id2 | id3
________________
1   |  5  | 3
3   |  4  | 2
2   |  3  | 1

I have a second table called XYZ with 2 fields, id and title with data :

id |  title
______________
1  |  title_1 
2  |  title_2 
3  |  title_3
4  |  title_4
5  |  title_5

The ids in table ABC match the ids of each record in ta开发者_运维知识库ble XYZ. What id like to do is join the ids in table ABC with those in table XYZ and display the titles in a row. So if the first two records in table ABC is outputted it will look like this:

title_1, title_5, title_3
title_3, title_4, title_2

Outputting in PHP is fine I'm just a little lost with the SQL. I've been trying to use left joins but I haven't got very far with it. Any help would be much appreciated.


You can join the same table multiple times with different join conditions:

SELECT xyz1.title as title1, xyz2.title as title2, xyz3.title as title3
FROM ABC
JOIN XYZ as xyz1 ON xyz1.id = ABC.id1
JOIN XYZ as xyz2 ON xyz2.id = ABC.id2
JOIN XYZ as xyz2 ON xyz3.id = ABC.id3

This shoud correctly output

title_1, title_5, title_3
title_3, title_4, title_2
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