2个内部联接2个表mysql

Question

I have 3 tables.

users
------------
id   |  Name   |
------------
44   |   user1 |
45   |useradmin|

Sections
------------
id | Name
------------
1  | Test   |

Assigns
------------
id | u_id | section_id | admin_u_id
-----------------------------------
1  | 44   |    1       |    45     |

I am trying to pull up the Assigns table and replace u_id and admin_u_id with the respective users names and section_id with the sections name.

What I have so far:

SELECT Assigns.u_id, Assigns.id, users.id,users.id
FROM Assigns
INNER JOIN users
ON Assigns.u_id=users.id
INNER JOIN users
ON Assigns.admin_u_id=users.id
INNER JOIN Sections
ON Assigns.section_id=Sections.id

What throws me off is the Select line. I want it to display users.id twice with different values.

Any help or push in the right direction is greatly appreciated.

Thanks!!!

EDIT: Here are the actual table names.

I do not get any errors in my MYSQL query just an empty set is returned

SELECT mrfv0_codes_assign.u_id, mrfv0_codes_assign.id, u1.id,u2.id 
FROM mrfv0_codes_assign 
INNER JOIN mrfv0_users u1 ON mrfv0_codes_assign.u_id=u1.id 
INNER JOIN mrfv0_users u2 ON mrfv0_codes_assign.admin_u_id=u2.id 
INNER JOIN mrfv0_codes_sections ON mrfv0_codes_assign.section_id=mrfv0_codes_sections.id

EDIT2: I am an idiot. I didn't set up my table properly. You all had the right answer! Sorry for wasting your time!!!

Answer 1

SELECT a.u_id,
       a.id,
       u1.name AS Username,
       u2.name AS AdminUsername,
       s.name AS SectionName
FROM mrfv0_codes_assign a
INNER JOIN mrfv0_users u1 ON a.u_id = u1.id
INNER JOIN mrfv0_users u2 ON a.admin_u_id = u2.id
INNER JOIN mrfv0_codes_sections s ON a.section_id = s.id

SQL Fiddle Example

Output

| U_ID | ID | USERNAME | ADMINUSERNAME | SECTIONNAME |
------------------------------------------------------
|   44 |  1 |    user1 |     useradmin |        Test |

Answer 2

SELECT Assigns.id AS id,
       users.name AS user_name, 
       admins.name AS admin_name, 
       Sections.name AS section_name
FROM Assigns
INNER JOIN users ON Assigns.u_id = users.id
INNER JOIN users AS admins ON Assigns.admin_u_id = admins.id
INNER JOIN Sections ON Assigns.section_id=Sections.id

Just add an alias on your INNER JOIN, it allows you to distinct user "user" table from user "admin" table.

Here, your result will be this kind of array : [id, user_name, admin_name, section_name]

Answer 3

Try assigning aliases to your tables. Example:

SELECT Assigns.u_id, Assigns.id, u1.id,u2.id
FROM Assigns
INNER JOIN users u1
ON Assigns.u_id=u1.id
INNER JOIN users u2
ON Assigns.admin_u_id=u2.id
INNER JOIN Sections
ON Assigns.section_id=Sections.id