根据外键联接两个表的哪个子列？

Question

I have the two following tables

Order

ID|      DETAILS       | AMOUNT
-------------------------------
0 |#Battery#Client1234 | 90USD

Client

ID   |  NAME
--------------
1234 | JohnDoe

How can I join these two tables since the foreign key in the Order table is aggregated with some other information ?

Answer 1

将列DETAILS分为两个OrderDerails和CLientID然后将ClientID与第二个表连接。

Answer 2

http://sqlfiddle.com/#!9/a8c9f6/1

SELECT o.*, c.*
FROM `order` o
LEFT JOIN client c
ON o.details LIKE CONCAT('%#Client',c.id)

Answer 3

Try:

SELECT * 
FROM Orders oo
JOIN Client cc
ON oo.details LIKE CONCAT('%', cc.id, '%');

Answer 4

You can extract the client id from the order details using MySQL SUBSTRING_INDEX() function and use it to do a join with the client table. Here is the query:

SELECT *
FROM `order` o
LEFT JOIN client c
ON c.id=SUBSTRING_INDEX(o.details,'#Client',-1);

SQL FIDDLE DEMO