Mysql需要从table1中获取一列两次，然后通过table2的两个不同列对它们进行排序

Question

So here is the thing, I have two tables:

• table1 has columns intUsersID, varUsersName

• table2 has columns intCouriers, intResponsible

intCouriers (have some numbers of intUsersID that are Couriers), and intResponsible (have some numbers of intUsersID that are Responsible)

In my query I must see User Names of Couriers and of the Responsible persons something like that:

SELECT 
    table1.varUsersName 'Couriers',
    table1.varUsersName 'Responsible'
FROM
    table1 
LEFT JOIN 
    table2 ON table2.intCouriers = table1.intUsersID

And then I need some how to subquery or join this "table1.varUsersName 'Responsible'", to get also 'Reponsible' persons. Please help me.

Answer 1

Should be this

SELECT table1.varUsersName 'Couriers', table2.varUsersName 'Responsible'
FROM table1 
INNER JOIN table3  on table1.intUsersID = table3.intCouriers
INNER JOIN table1  as Table2 on  table2.intUsersID = table3. intResponsible

Answer 2

SELECT Couriers.varUsersName as "Couriers",
       Responsible.varUsersName as "Responsible"
FROM   `table2` t2
   LEFT JOIN table1 Couriers on Couriers.intUsersID = t2.intCouriers
   LEFT JOIN table1 Responsible on Responsible.intUsersID = t2.intResponsible