关联另一个表的 2 列

Question

I have the following 2 tables in Mysql:

table name:store (store user id's)
emp dst
1    2
1    3
2    1
3    1
4    2

table name:users
id   name
1    empA
2    empB
3    empC
4    empD

How should my query be to obtain the following result based on the store table?

result
emp  dst
empA empB
empA empC
empB empA
empC empA
empD empB

Answer 1

Just join store and users together. But you should join users twice as you want names for both emp and dst.

So the query might be:

SELECT u1.name AS emp, u2.name AS dst 
FROM store AS s 
JOIN users AS u1 ON s.emp = u1.id 
JOIN users AS u2 ON s.dst = u2.id;